21236556104 has 32 divisors (see below), whose sum is σ = 41041391040. Its totient is φ = 10297089600.

The previous prime is 21236556097. The next prime is 21236556181. The reversal of 21236556104 is 40165563212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271814 + ... + 341109.

It is an arithmetic number, because the mean of its divisors is an integer number (1282543470).

Almost surely, 2^21236556104 is an apocalyptic number.

It is an amenable number.

21236556104 is a deficient number, since it is larger than the sum of its proper divisors (19804834936).

21236556104 is a wasteful number, since it uses less digits than its factorization.

21236556104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613061 (or 613057 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21236556104 in words is "twenty-one billion, two hundred thirty-six million, five hundred fifty-six thousand, one hundred four".