21426422625321 has 32 divisors (see below), whose sum is σ = 33320036217600. Its totient is φ = 12242226834432.

The previous prime is 21426422625263. The next prime is 21426422625367. The reversal of 21426422625321 is 12352622462412.

It is not a de Polignac number, because 21426422625321 - 2⁷ = 21426422625193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21426422621321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7536891 + ... + 9982863.

It is an arithmetic number, because the mean of its divisors is an integer number (1041251131800).

Almost surely, 2^{21426422625321} is an apocalyptic number.

21426422625321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21426422625321 is a deficient number, since it is larger than the sum of its proper divisors (11893613592279).

21426422625321 is an equidigital number, since it uses as much as digits as its factorization.

21426422625321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454510 (or 2454496 counting only the distinct ones).

The product of its digits is 552960, while the sum is 42.

The spelling of 21426422625321 in words is "twenty-one trillion, four hundred twenty-six billion, four hundred twenty-two million, six hundred twenty-five thousand, three hundred twenty-one".