121021132431 has 32 divisors (see below), whose sum is σ = 172196236800. Its totient is φ = 75338726400.

The previous prime is 121021132423. The next prime is 121021132457. The reversal of 121021132431 is 134231120121.

It is not a de Polignac number, because 121021132431 - 2³ = 121021132423 is a prime.

It is a super-2 number, since 2×121021132431² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121021132398 and 121021132407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021132231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12762550 + ... + 12772028.

It is an arithmetic number, because the mean of its divisors is an integer number (5381132400).

Almost surely, 2^121021132431 is an apocalyptic number.

121021132431 is a deficient number, since it is larger than the sum of its proper divisors (51175104369).

121021132431 is a wasteful number, since it uses less digits than its factorization.

121021132431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11439.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 121021132431 its reverse (134231120121), we get a palindrome (255252252552).

The spelling of 121021132431 in words is "one hundred twenty-one billion, twenty-one million, one hundred thirty-two thousand, four hundred thirty-one".