121621074751 has 4 divisors (see below), whose sum is σ = 132677536104. Its totient is φ = 110564613400.

The previous prime is 121621074749. The next prime is 121621074763. The reversal of 121621074751 is 157470126121.

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 121621074751 - 2¹ = 121621074749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121621074751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121621074451) 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, 5528230660 + ... + 5528230681.

It is an arithmetic number, because the mean of its divisors is an integer number (33169384026).

Almost surely, 2^121621074751 is an apocalyptic number.

121621074751 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121621074751 is a deficient number, since it is larger than the sum of its proper divisors (11056461353).

121621074751 is a wasteful number, since it uses less digits than its factorization.

121621074751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11056461352.

The product of its (nonzero) digits is 23520, while the sum is 37.

The spelling of 121621074751 in words is "one hundred twenty-one billion, six hundred twenty-one million, seventy-four thousand, seven hundred fifty-one".