100121021200 has 60 divisors (see below), whose sum is σ = 244130979280. Its totient is φ = 39450660480.

The previous prime is 100121021197. The next prime is 100121021251. The reversal of 100121021200 is 2120121001.

It is a super-2 number, since 2×100121021200² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

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 11 ways as a sum of consecutive naturals, for example, 1841130 + ... + 1894729.

Almost surely, 2^100121021200 is an apocalyptic number.

100121021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121021200 is an abundant number, since it is smaller than the sum of its proper divisors (144009958080).

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

100121021200 is a wasteful number, since it uses less digits than its factorization.

100121021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735944 (or 3735933 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100121021200 its reverse (2120121001), we get a palindrome (102241142201).

The spelling of 100121021200 in words is "one hundred billion, one hundred twenty-one million, twenty-one thousand, two hundred".