21957032 has 8 divisors (see below), whose sum is σ = 41169450. Its totient is φ = 10978512.

The previous prime is 21956983. The next prime is 21957043. The reversal of 21957032 is 23075912.

It can be written as a sum of positive squares in only one way, i.e., 18369796 + 3587236 = 4286^2 + 1894^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21957032² = 964222508498048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21956986 and 21957004.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1372307 + ... + 1372322.

Almost surely, 2^21957032 is an apocalyptic number.

It is an amenable number.

21957032 is a deficient number, since it is larger than the sum of its proper divisors (19212418).

21957032 is a wasteful number, since it uses less digits than its factorization.

21957032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744635 (or 2744631 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 21957032 is about 4685.8331169601. The cubic root of 21957032 is about 280.0213929233.

The spelling of 21957032 in words is "twenty-one million, nine hundred fifty-seven thousand, thirty-two".