20100121984 has 16 divisors (see below), whose sum is σ = 40043212020. Its totient is φ = 10050060928.

The previous prime is 20100121969. The next prime is 20100121997. The reversal of 20100121984 is 48912100102.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78515974 + ... + 78516229.

Almost surely, 2^20100121984 is an apocalyptic number.

It is an amenable number.

20100121984 is a deficient number, since it is larger than the sum of its proper divisors (19943090036).

20100121984 is an equidigital number, since it uses as much as digits as its factorization.

20100121984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157032217 (or 157032205 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 20100121984 in words is "twenty billion, one hundred million, one hundred twenty-one thousand, nine hundred eighty-four".