47721212 has 48 divisors (see below), whose sum is σ = 106686720. Its totient is φ = 18134400.

The previous prime is 47721199. The next prime is 47721241. The reversal of 47721212 is 21212774.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10739 + ... + 14517.

It is an arithmetic number, because the mean of its divisors is an integer number (2222640).

Almost surely, 2^47721212 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 47721212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53343360).

47721212 is an abundant number, since it is smaller than the sum of its proper divisors (58965508).

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

47721212 is a wasteful number, since it uses less digits than its factorization.

47721212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3842 (or 3840 counting only the distinct ones).

The product of its digits is 1568, while the sum is 26.

The square root of 47721212 is about 6908.0541399152. The cubic root of 47721212 is about 362.7191527777.

Adding to 47721212 its reverse (21212774), we get a palindrome (68933986).

The spelling of 47721212 in words is "forty-seven million, seven hundred twenty-one thousand, two hundred twelve".