21255032 has 32 divisors (see below), whose sum is σ = 42411600. Its totient is φ = 9951744.

The previous prime is 21255019. The next prime is 21255061. The reversal of 21255032 is 23055212.

It is a junction number, because it is equal to n+sod(n) for n = 21254995 and 21255013.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 50519 + ... + 50937.

Almost surely, 2^21255032 is an apocalyptic number.

It is an amenable number.

21255032 is a deficient number, since it is larger than the sum of its proper divisors (21156568).

21255032 is a wasteful number, since it uses less digits than its factorization.

21255032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 21255032 is about 4610.3179933710. The cubic root of 21255032 is about 277.0047742968.

It can be divided in two parts, 2125 and 5032, that multiplied together give a triangular number (10693000 = T₄₆₂₄).

The spelling of 21255032 in words is "twenty-one million, two hundred fifty-five thousand, thirty-two".