121012020100 has 36 divisors (see below), whose sum is σ = 262679687424. Its totient is φ = 48389397280.

The previous prime is 121012020083. The next prime is 121012020109. The reversal of 121012020100 is 1020210121.

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 (121012020109) 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, 125649 + ... + 507751.

It is an arithmetic number, because the mean of its divisors is an integer number (7296657984).

Almost surely, 2^121012020100 is an apocalyptic number.

121012020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121012020100 is an abundant number, since it is smaller than the sum of its proper divisors (141667667324).

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

121012020100 is a wasteful number, since it uses less digits than its factorization.

121012020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385284 (or 385277 counting only the distinct ones).

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

Adding to 121012020100 its reverse (1020210121), we get a palindrome (122032230221).

The spelling of 121012020100 in words is "one hundred twenty-one billion, twelve million, twenty thousand, one hundred".