21542552412 has 48 divisors (see below), whose sum is σ = 52925362560. Its totient is φ = 6801133248.

The previous prime is 21542552389. The next prime is 21542552453. The reversal of 21542552412 is 21425524512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1069143 + ... + 1089105.

It is an arithmetic number, because the mean of its divisors is an integer number (1102611720).

Almost surely, 2^21542552412 is an apocalyptic number.

It is an amenable number.

21542552412 is an abundant number, since it is smaller than the sum of its proper divisors (31382810148).

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

21542552412 is a wasteful number, since it uses less digits than its factorization.

21542552412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24722 (or 24720 counting only the distinct ones).

The product of its digits is 32000, while the sum is 33.

The spelling of 21542552412 in words is "twenty-one billion, five hundred forty-two million, five hundred fifty-two thousand, four hundred twelve".