47212220 has 48 divisors (see below), whose sum is σ = 109807488. Its totient is φ = 16906560.

The previous prime is 47212211. The next prime is 47212229. The reversal of 47212220 is 2221274.

It is a happy number.

47212220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (47212211) and next prime (47212229).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 47212192 and 47212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47212229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13139 + ... + 16341.

It is an arithmetic number, because the mean of its divisors is an integer number (2287656).

Almost surely, 2^47212220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54903744).

47212220 is an abundant number, since it is smaller than the sum of its proper divisors (62595268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47212220 is a wasteful number, since it uses less digits than its factorization.

47212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290 (or 3288 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 47212220 is about 6871.1149022557. The cubic root of 47212220 is about 361.4249592516.

Adding to 47212220 its reverse (2221274), we get a palindrome (49433494).

The spelling of 47212220 in words is "forty-seven million, two hundred twelve thousand, two hundred twenty".