21919032 has 32 divisors (see below), whose sum is σ = 60886800. Its totient is φ = 7306272.

The previous prime is 21919021. The next prime is 21919033. The reversal of 21919032 is 23091912.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21918987 and 21919005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919033) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 50523 + ... + 50954.

Almost surely, 2^21919032 is an apocalyptic number.

It is an amenable number.

21919032 is an abundant number, since it is smaller than the sum of its proper divisors (38967768).

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

21919032 is a wasteful number, since it uses less digits than its factorization.

21919032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101492 (or 101482 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 21919032 is about 4681.7765858699. The cubic root of 21919032 is about 279.8597597032.

The spelling of 21919032 in words is "twenty-one million, nine hundred nineteen thousand, thirty-two".