21032156 has 12 divisors (see below), whose sum is σ = 37000320. Its totient is φ = 10460640.

The previous prime is 21032153. The next prime is 21032159. The reversal of 21032156 is 65123012.

It is an interprime number because it is at equal distance from previous prime (21032153) and next prime (21032159).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13001 + ... + 14528.

It is an arithmetic number, because the mean of its divisors is an integer number (3083360).

Almost surely, 2^21032156 is an apocalyptic number.

It is an amenable number.

21032156 is a deficient number, since it is larger than the sum of its proper divisors (15968164).

21032156 is a wasteful number, since it uses less digits than its factorization.

21032156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27724 (or 27722 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21032156 is about 4586.0828601324. The cubic root of 21032156 is about 276.0331648167.

Adding to 21032156 its reverse (65123012), we get a palindrome (86155168).

The spelling of 21032156 in words is "twenty-one million, thirty-two thousand, one hundred fifty-six".