121955404920 has 64 divisors (see below), whose sum is σ = 377668362240. Its totient is φ = 31472361600.

The previous prime is 121955404897. The next prime is 121955404927. The reversal of 121955404920 is 29404559121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121955404927) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16388136 + ... + 16395575.

It is an arithmetic number, because the mean of its divisors is an integer number (5901068160).

Almost surely, 2^121955404920 is an apocalyptic number.

121955404920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121955404920 is an abundant number, since it is smaller than the sum of its proper divisors (255712957320).

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

121955404920 is a wasteful number, since it uses less digits than its factorization.

121955404920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32783756 (or 32783752 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 121955404920 in words is "one hundred twenty-one billion, nine hundred fifty-five million, four hundred four thousand, nine hundred twenty".