21421525422 has 32 divisors (see below), whose sum is σ = 46759089024. Its totient is φ = 6488424800.

The previous prime is 21421525397. The next prime is 21421525453. The reversal of 21421525422 is 22452512412.

It is a self number, because there is not a number n which added to its sum of digits gives 21421525422.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75097 + ... + 220187.

It is an arithmetic number, because the mean of its divisors is an integer number (1461221532).

Almost surely, 2^21421525422 is an apocalyptic number.

21421525422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21421525422 is an abundant number, since it is smaller than the sum of its proper divisors (25337563602).

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

21421525422 is a wasteful number, since it uses less digits than its factorization.

21421525422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147344.

The product of its digits is 12800, while the sum is 30.

The spelling of 21421525422 in words is "twenty-one billion, four hundred twenty-one million, five hundred twenty-five thousand, four hundred twenty-two".