21255366306604 has 12 divisors (see below), whose sum is σ = 37276541770104. Its totient is φ = 10604925800864.

The previous prime is 21255366306589. The next prime is 21255366306641. The reversal of 21255366306604 is 40660366355212.

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, 5689336009 + ... + 5689339744.

It is an arithmetic number, because the mean of its divisors is an integer number (3106378480842).

Almost surely, 2^{21255366306604} is an apocalyptic number.

It is an amenable number.

21255366306604 is a deficient number, since it is larger than the sum of its proper divisors (16021175463500).

21255366306604 is a wasteful number, since it uses less digits than its factorization.

21255366306604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11378676224 (or 11378676222 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 49.

The spelling of 21255366306604 in words is "twenty-one trillion, two hundred fifty-five billion, three hundred sixty-six million, three hundred six thousand, six hundred four".