47245221 has 16 divisors (see below), whose sum is σ = 70333120. Its totient is φ = 31343760.

The previous prime is 47245213. The next prime is 47245223. The reversal of 47245221 is 12254274.

It is not a de Polignac number, because 47245221 - 2³ = 47245213 is a prime.

It is a super-2 number, since 2×47245221² = 4464221814677682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47245223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1551 + ... + 9843.

It is an arithmetic number, because the mean of its divisors is an integer number (4395820).

Almost surely, 2^47245221 is an apocalyptic number.

It is an amenable number.

47245221 is a deficient number, since it is larger than the sum of its proper divisors (23087899).

47245221 is a wasteful number, since it uses less digits than its factorization.

47245221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8513 (or 8507 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 47245221 is about 6873.5159125443. The cubic root of 47245221 is about 361.5091507816.

Adding to 47245221 its reverse (12254274), we get a palindrome (59499495).

It can be divided in two parts, 472 and 45221, that multiplied together give a palindrome (21344312).

The spelling of 47245221 in words is "forty-seven million, two hundred forty-five thousand, two hundred twenty-one".