121755372252 has 12 divisors (see below), whose sum is σ = 284095868616. Its totient is φ = 40585124080.

The previous prime is 121755372241. The next prime is 121755372259. The reversal of 121755372252 is 252273557121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121755372259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5073140499 + ... + 5073140522.

It is an arithmetic number, because the mean of its divisors is an integer number (23674655718).

Almost surely, 2^121755372252 is an apocalyptic number.

121755372252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121755372252 is an abundant number, since it is smaller than the sum of its proper divisors (162340496364).

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

121755372252 is a wasteful number, since it uses less digits than its factorization.

121755372252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10146281028 (or 10146281026 counting only the distinct ones).

The product of its digits is 294000, while the sum is 42.

The spelling of 121755372252 in words is "one hundred twenty-one billion, seven hundred fifty-five million, three hundred seventy-two thousand, two hundred fifty-two".