21000120212108 has 12 divisors (see below), whose sum is σ = 36846163925760. Its totient is φ = 10472644804752.

The previous prime is 21000120212089. The next prime is 21000120212111. The reversal of 21000120212108 is 80121202100012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000120212108.

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, 6853823603 + ... + 6853826666.

It is an arithmetic number, because the mean of its divisors is an integer number (3070513660480).

Almost surely, 2^{21000120212108} is an apocalyptic number.

It is an amenable number.

21000120212108 is a deficient number, since it is larger than the sum of its proper divisors (15846043713652).

21000120212108 is a wasteful number, since it uses less digits than its factorization.

21000120212108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13707650656 (or 13707650654 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 21000120212108 in words is "twenty-one trillion, one hundred twenty million, two hundred twelve thousand, one hundred eight".