121432131021 has 16 divisors (see below), whose sum is σ = 166166521664. Its totient is φ = 78837421824.

The previous prime is 121432131011. The next prime is 121432131047. The reversal of 121432131021 is 120131234121.

It is not a de Polignac number, because 121432131021 - 2¹³ = 121432122829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121432131011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1353166 + ... + 1440111.

It is an arithmetic number, because the mean of its divisors is an integer number (10385407604).

Almost surely, 2^121432131021 is an apocalyptic number.

It is an amenable number.

121432131021 is a deficient number, since it is larger than the sum of its proper divisors (44734390643).

121432131021 is a wasteful number, since it uses less digits than its factorization.

121432131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793660.

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

Adding to 121432131021 its reverse (120131234121), we get a palindrome (241563365142).

The spelling of 121432131021 in words is "one hundred twenty-one billion, four hundred thirty-two million, one hundred thirty-one thousand, twenty-one".