31204540140121 has 128 divisors (see below), whose sum is σ = 36567940147200. Its totient is φ = 26449793187840.

The previous prime is 31204540140077. The next prime is 31204540140139. The reversal of 31204540140121 is 12104104540213.

It is a happy number.

It is not a de Polignac number, because 31204540140121 - 2⁹ = 31204540139609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31204540140121.

It is not an unprimeable number, because it can be changed into a prime (31204540144121) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 71080956820 + ... + 71080957258.

It is an arithmetic number, because the mean of its divisors is an integer number (285687032400).

Almost surely, 2^{31204540140121} is an apocalyptic number.

It is an amenable number.

31204540140121 is a deficient number, since it is larger than the sum of its proper divisors (5363400007079).

31204540140121 is a wasteful number, since it uses less digits than its factorization.

31204540140121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 31204540140121 its reverse (12104104540213), we get a palindrome (43308644680334).

The spelling of 31204540140121 in words is "thirty-one trillion, two hundred four billion, five hundred forty million, one hundred forty thousand, one hundred twenty-one".