21392064 has 42 divisors (see below), whose sum is σ = 61318140. Its totient is φ = 7130496.

The previous prime is 21392057. The next prime is 21392071. The reversal of 21392064 is 46029312.

It is an interprime number because it is at equal distance from previous prime (21392057) and next prime (21392071).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17994 + ... + 19145.

Almost surely, 2^21392064 is an apocalyptic number.

21392064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21392064 is an abundant number, since it is smaller than the sum of its proper divisors (39926076).

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

21392064 is a wasteful number, since it uses less digits than its factorization.

21392064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37157 (or 37144 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21392064 is about 4625.1555649513. The cubic root of 21392064 is about 277.5987863534.

The spelling of 21392064 in words is "twenty-one million, three hundred ninety-two thousand, sixty-four".