121755372251 has 4 divisors (see below), whose sum is σ = 127049084112. Its totient is φ = 116461660392.

The previous prime is 121755372241. The next prime is 121755372259. The reversal of 121755372251 is 152273557121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121755372251 - 2¹⁴ = 121755355867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121755372199 and 121755372208.

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, 2646855896 + ... + 2646855941.

It is an arithmetic number, because the mean of its divisors is an integer number (31762271028).

Almost surely, 2^121755372251 is an apocalyptic number.

121755372251 is a deficient number, since it is larger than the sum of its proper divisors (5293711861).

121755372251 is an equidigital number, since it uses as much as digits as its factorization.

121755372251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293711860.

The product of its digits is 147000, while the sum is 41.

The spelling of 121755372251 in words is "one hundred twenty-one billion, seven hundred fifty-five million, three hundred seventy-two thousand, two hundred fifty-one".