121304512311531 has 16 divisors (see below), whose sum is σ = 167526501760800. Its totient is φ = 77983096636928.

The previous prime is 121304512311497. The next prime is 121304512311557. The reversal of 121304512311531 is 135113215403121.

It is a cyclic number.

It is not a de Polignac number, because 121304512311531 - 2¹⁸ = 121304512049387 is a prime.

It is a super-2 number, since 2×121304512311531² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121304512311492 and 121304512311501.

It is not an unprimeable number, because it can be changed into a prime (121304512311571) 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, 874651326 + ... + 874790003.

It is an arithmetic number, because the mean of its divisors is an integer number (10470406360050).

Almost surely, 2^{121304512311531} is an apocalyptic number.

121304512311531 is a deficient number, since it is larger than the sum of its proper divisors (46221989449269).

121304512311531 is a wasteful number, since it uses less digits than its factorization.

121304512311531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749442158.

The product of its (nonzero) digits is 10800, while the sum is 33.

Adding to 121304512311531 its reverse (135113215403121), we get a palindrome (256417727714652).

The spelling of 121304512311531 in words is "one hundred twenty-one trillion, three hundred four billion, five hundred twelve million, three hundred eleven thousand, five hundred thirty-one".