121751623431 has 48 divisors (see below), whose sum is σ = 184481256960. Its totient is φ = 77294528640.

The previous prime is 121751623421. The next prime is 121751623453. The reversal of 121751623431 is 134326157121.

121751623431 is a `hidden beast` number, since 1 + 21 + 7 + 5 + 1 + 623 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 121751623431 - 2¹⁰ = 121751622407 is a prime.

It is a super-2 number, since 2×121751623431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121751623421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6563736 + ... + 6582258.

It is an arithmetic number, because the mean of its divisors is an integer number (3843359520).

Almost surely, 2^121751623431 is an apocalyptic number.

121751623431 is a deficient number, since it is larger than the sum of its proper divisors (62729633529).

121751623431 is a wasteful number, since it uses less digits than its factorization.

121751623431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18996 (or 18993 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The spelling of 121751623431 in words is "one hundred twenty-one billion, seven hundred fifty-one million, six hundred twenty-three thousand, four hundred thirty-one".