21551426612 has 12 divisors (see below), whose sum is σ = 37716860160. Its totient is φ = 10775180856.

The previous prime is 21551426599. The next prime is 21551426621. The reversal of 21551426612 is 21662415512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33812 + ... + 210347.

It is an arithmetic number, because the mean of its divisors is an integer number (3143071680).

Almost surely, 2^21551426612 is an apocalyptic number.

It is an amenable number.

21551426612 is a deficient number, since it is larger than the sum of its proper divisors (16165433548).

21551426612 is a wasteful number, since it uses less digits than its factorization.

21551426612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266230 (or 266228 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The spelling of 21551426612 in words is "twenty-one billion, five hundred fifty-one million, four hundred twenty-six thousand, six hundred twelve".