10120021990 has 32 divisors (see below), whose sum is σ = 19716903360. Its totient is φ = 3717646464.

The previous prime is 10120021981. The next prime is 10120022009. The reversal of 10120021990 is 9912002101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171970 + ... + 223189.

It is an arithmetic number, because the mean of its divisors is an integer number (616153230).

Almost surely, 2^10120021990 is an apocalyptic number.

10120021990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10120021990 is a deficient number, since it is larger than the sum of its proper divisors (9596881370).

10120021990 is a wasteful number, since it uses less digits than its factorization.

10120021990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395376.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 10120021990 in words is "ten billion, one hundred twenty million, twenty-one thousand, nine hundred ninety".