100120021992 has 48 divisors (see below), whose sum is σ = 273109200000. Its totient is φ = 33133241376.

The previous prime is 100120021933. The next prime is 100120021993. The reversal of 100120021992 is 299120021001.

It is not an unprimeable number, because it can be changed into a prime (100120021993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4991992 + ... + 5012007.

It is an arithmetic number, because the mean of its divisors is an integer number (5689775000).

Almost surely, 2^100120021992 is an apocalyptic number.

100120021992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

100120021992 is an abundant number, since it is smaller than the sum of its proper divisors (172989178008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100120021992 is a wasteful number, since it uses less digits than its factorization.

100120021992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10004150 (or 10004143 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

Adding to 100120021992 its reverse (299120021001), we get a palindrome (399240042993).

The spelling of 100120021992 in words is "one hundred billion, one hundred twenty million, twenty-one thousand, nine hundred ninety-two".