121751552431 has 4 divisors (see below), whose sum is σ = 122640250032. Its totient is φ = 120862854832.

The previous prime is 121751552311. The next prime is 121751552519. The reversal of 121751552431 is 134255157121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134255157121 = 563 ⋅238463867.

It is a cyclic number.

It is not a de Polignac number, because 121751552431 - 2⁹ = 121751551919 is a prime.

It is a super-2 number, since 2×121751552431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121751558431) 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, 444348595 + ... + 444348868.

It is an arithmetic number, because the mean of its divisors is an integer number (30660062508).

Almost surely, 2^121751552431 is an apocalyptic number.

121751552431 is a deficient number, since it is larger than the sum of its proper divisors (888697601).

121751552431 is an equidigital number, since it uses as much as digits as its factorization.

121751552431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888697600.

The product of its digits is 42000, while the sum is 37.

The spelling of 121751552431 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred fifty-two thousand, four hundred thirty-one".