21025088 has 56 divisors (see below), whose sum is σ = 48426624. Its totient is φ = 8870400.

The previous prime is 21025051. The next prime is 21025091. The reversal of 21025088 is 88052012.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31478 + ... + 32138.

Almost surely, 2^21025088 is an apocalyptic number.

21025088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21025088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24213312).

21025088 is an abundant number, since it is smaller than the sum of its proper divisors (27401536).

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

21025088 is an equidigital number, since it uses as much as digits as its factorization.

21025088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 21025088 is about 4585.3122031111. The cubic root of 21025088 is about 276.0022404075.

The spelling of 21025088 in words is "twenty-one million, twenty-five thousand, eighty-eight".