21700032 has 28 divisors (see below), whose sum is σ = 57415176. Its totient is φ = 7233280.

The previous prime is 21700001. The next prime is 21700039. The reversal of 21700032 is 23000712.

It is a junction number, because it is equal to n+sod(n) for n = 21699984 and 21700020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56319 + ... + 56702.

It is an arithmetic number, because the mean of its divisors is an integer number (2050542).

Almost surely, 2^21700032 is an apocalyptic number.

It is an amenable number.

21700032 is an abundant number, since it is smaller than the sum of its proper divisors (35715144).

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

21700032 is a wasteful number, since it uses less digits than its factorization.

21700032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113036 (or 113026 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 21700032 is about 4658.3293142499. The cubic root of 21700032 is about 278.9245823312.

Adding to 21700032 its reverse (23000712), we get a palindrome (44700744).

The spelling of 21700032 in words is "twenty-one million, seven hundred thousand, thirty-two".