121520443100 has 72 divisors (see below), whose sum is σ = 309515918880. Its totient is φ = 40538085120.

The previous prime is 121520443073. The next prime is 121520443139. The reversal of 121520443100 is 1344025121.

It is a super-2 number, since 2×121520443100² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2320055 + ... + 2371854.

Almost surely, 2^121520443100 is an apocalyptic number.

121520443100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121520443100 is an abundant number, since it is smaller than the sum of its proper divisors (187995475780).

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

121520443100 is a wasteful number, since it uses less digits than its factorization.

121520443100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4691967 (or 4691960 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 121520443100 its reverse (1344025121), we get a palindrome (122864468221).

The spelling of 121520443100 in words is "one hundred twenty-one billion, five hundred twenty million, four hundred forty-three thousand, one hundred".