121435906180 has 24 divisors (see below), whose sum is σ = 255045667968. Its totient is φ = 48568597728.

The previous prime is 121435906169. The next prime is 121435906187. The reversal of 121435906180 is 81609534121.

It is not an unprimeable number, because it can be changed into a prime (121435906187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185494 + ... + 526573.

It is an arithmetic number, because the mean of its divisors is an integer number (10626902832).

Almost surely, 2^121435906180 is an apocalyptic number.

121435906180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121435906180 is an abundant number, since it is smaller than the sum of its proper divisors (133609761788).

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

121435906180 is a wasteful number, since it uses less digits than its factorization.

121435906180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720603 (or 720601 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 121435906180 in words is "one hundred twenty-one billion, four hundred thirty-five million, nine hundred six thousand, one hundred eighty".