21030025408 has 42 divisors (see below), whose sum is σ = 48544762956. Its totient is φ = 9012866688.

The previous prime is 21030025397. The next prime is 21030025441. The reversal of 21030025408 is 80452003012.

It is a super-2 number, since 2×21030025408² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3349866 + ... + 3356137.

Almost surely, 2^21030025408 is an apocalyptic number.

21030025408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21030025408 is an abundant number, since it is smaller than the sum of its proper divisors (27514737548).

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

21030025408 is an equidigital number, since it uses as much as digits as its factorization.

21030025408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6706029 (or 6706012 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 21030025408 in words is "twenty-one billion, thirty million, twenty-five thousand, four hundred eight".