121755721074 has 32 divisors (see below), whose sum is σ = 276045362880. Its totient is φ = 35491545792.

The previous prime is 121755721057. The next prime is 121755721099. The reversal of 121755721074 is 470127557121.

121755721074 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×121755721074² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41076697 + ... + 41079660.

It is an arithmetic number, because the mean of its divisors is an integer number (8626417590).

Almost surely, 2^121755721074 is an apocalyptic number.

121755721074 is an abundant number, since it is smaller than the sum of its proper divisors (154289641806).

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

121755721074 is a wasteful number, since it uses less digits than its factorization.

121755721074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82156394.

The product of its (nonzero) digits is 137200, while the sum is 42.

The spelling of 121755721074 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred twenty-one thousand, seventy-four".