21140088 has 32 divisors (see below), whose sum is σ = 52972800. Its totient is φ = 7030368.

The previous prime is 21140069. The next prime is 21140089. The reversal of 21140088 is 88004112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140089) 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, 14145 + ... + 15567.

It is an arithmetic number, because the mean of its divisors is an integer number (1655400).

Almost surely, 2^21140088 is an apocalyptic number.

It is an amenable number.

21140088 is an abundant number, since it is smaller than the sum of its proper divisors (31832712).

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

21140088 is a wasteful number, since it uses less digits than its factorization.

21140088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051 (or 2047 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 21140088 is about 4597.8351427601. The cubic root of 21140088 is about 276.5045381613.

The spelling of 21140088 in words is "twenty-one million, one hundred forty thousand, eighty-eight".