21542612628 has 48 divisors (see below), whose sum is σ = 51978967040. Its totient is φ = 6936991200.

The previous prime is 21542612591. The next prime is 21542612629. The reversal of 21542612628 is 82621624512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21542612629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161703 + ... + 263121.

Almost surely, 2^21542612628 is an apocalyptic number.

It is an amenable number.

21542612628 is an abundant number, since it is smaller than the sum of its proper divisors (30436354412).

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

21542612628 is a wasteful number, since it uses less digits than its factorization.

21542612628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102028 (or 102026 counting only the distinct ones).

The product of its digits is 92160, while the sum is 39.

The spelling of 21542612628 in words is "twenty-one billion, five hundred forty-two million, six hundred twelve thousand, six hundred twenty-eight".