21900558751906 has 16 divisors (see below), whose sum is σ = 32856098065920. Its totient is φ = 10948526221360.

The previous prime is 21900558751889. The next prime is 21900558751933. The reversal of 21900558751906 is 60915785500912.

It is a happy number.

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, 473287551 + ... + 473333821.

It is an arithmetic number, because the mean of its divisors is an integer number (2053506129120).

Almost surely, 2^{21900558751906} is an apocalyptic number.

21900558751906 is a deficient number, since it is larger than the sum of its proper divisors (10955539314014).

21900558751906 is a wasteful number, since it uses less digits than its factorization.

21900558751906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79049.

The product of its (nonzero) digits is 6804000, while the sum is 58.

The spelling of 21900558751906 in words is "twenty-one trillion, nine hundred billion, five hundred fifty-eight million, seven hundred fifty-one thousand, nine hundred six".