21755032 has 24 divisors (see below), whose sum is σ = 44172540. Its totient is φ = 10040160.

The previous prime is 21755021. The next prime is 21755077. The reversal of 21755032 is 23055712.

It is a junction number, because it is equal to n+sod(n) for n = 21754988 and 21755006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6694 + ... + 9397.

Almost surely, 2^21755032 is an apocalyptic number.

It is an amenable number.

21755032 is an abundant number, since it is smaller than the sum of its proper divisors (22417508).

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

21755032 is a wasteful number, since it uses less digits than its factorization.

21755032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16123 (or 16106 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21755032 is about 4664.2289823721. The cubic root of 21755032 is about 279.1600337426.

The spelling of 21755032 in words is "twenty-one million, seven hundred fifty-five thousand, thirty-two".