21088464 has 40 divisors (see below), whose sum is σ = 54734592. Its totient is φ = 6996480.

The previous prime is 21088453. The next prime is 21088469. The reversal of 21088464 is 46488012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10657 + ... + 12479.

Almost surely, 2^21088464 is an apocalyptic number.

21088464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21088464 is an abundant number, since it is smaller than the sum of its proper divisors (33646128).

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

21088464 is a wasteful number, since it uses less digits than its factorization.

21088464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075 (or 2069 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 21088464 is about 4592.2177648713. The cubic root of 21088464 is about 276.2792804218.

The spelling of 21088464 in words is "twenty-one million, eighty-eight thousand, four hundred sixty-four".