21015250422 has 32 divisors (see below), whose sum is σ = 43713035520. Its totient is φ = 6730002720.

The previous prime is 21015250411. The next prime is 21015250457. The reversal of 21015250422 is 22405251012.

It is a junction number, because it is equal to n+sod(n) for n = 21015250392 and 21015250401.

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, 651922 + ... + 683397.

It is an arithmetic number, because the mean of its divisors is an integer number (1366032360).

Almost surely, 2^21015250422 is an apocalyptic number.

21015250422 is an abundant number, since it is smaller than the sum of its proper divisors (22697785098).

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

21015250422 is a wasteful number, since it uses less digits than its factorization.

21015250422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335428.

The product of its (nonzero) digits is 1600, while the sum is 24.

The spelling of 21015250422 in words is "twenty-one billion, fifteen million, two hundred fifty thousand, four hundred twenty-two".