21542625321 has 32 divisors (see below), whose sum is σ = 34085318400. Its totient is φ = 11841312000.

The previous prime is 21542625319. The next prime is 21542625347. The reversal of 21542625321 is 12352624512.

It is a happy number.

It is not a de Polignac number, because 21542625321 - 2¹ = 21542625319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21542629321) 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, 98071 + ... + 229571.

It is an arithmetic number, because the mean of its divisors is an integer number (1065166200).

Almost surely, 2^21542625321 is an apocalyptic number.

21542625321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21542625321 is a deficient number, since it is larger than the sum of its proper divisors (12542693079).

21542625321 is a wasteful number, since it uses less digits than its factorization.

21542625321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131809.

The product of its digits is 28800, while the sum is 33.

The spelling of 21542625321 in words is "twenty-one billion, five hundred forty-two million, six hundred twenty-five thousand, three hundred twenty-one".