121010112100 has 18 divisors (see below), whose sum is σ = 262591943474. Its totient is φ = 48404044800.

The previous prime is 121010112077. The next prime is 121010112103. The reversal of 121010112100 is 1211010121.

It can be written as a sum of positive squares in 3 ways, for example, as 155151936 + 120854960164 = 12456^2 + 347642^2 .

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

It is not an unprimeable number, because it can be changed into a prime (121010112103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 605050461 + ... + 605050660.

Almost surely, 2^121010112100 is an apocalyptic number.

121010112100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121010112100 is an abundant number, since it is smaller than the sum of its proper divisors (141581831374).

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

121010112100 is a wasteful number, since it uses less digits than its factorization.

121010112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210101135 (or 1210101128 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121010112100 its reverse (1211010121), we get a palindrome (122221122221).

The spelling of 121010112100 in words is "one hundred twenty-one billion, ten million, one hundred twelve thousand, one hundred".