21919488 has 36 divisors (see below), whose sum is σ = 58339848. Its totient is φ = 7306240.

The previous prime is 21919487. The next prime is 21919501. The reversal of 21919488 is 88491912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919481) 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, 13503 + ... + 15038.

Almost surely, 2^21919488 is an apocalyptic number.

It is an amenable number.

21919488 is an abundant number, since it is smaller than the sum of its proper divisors (36420360).

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

21919488 is an equidigital number, since it uses as much as digits as its factorization.

21919488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28560 (or 28546 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 21919488 is about 4681.8252850785. The cubic root of 21919488 is about 279.8617004088.

The spelling of 21919488 in words is "twenty-one million, nine hundred nineteen thousand, four hundred eighty-eight".