31240140321 has 16 divisors (see below), whose sum is σ = 47496322944. Its totient is φ = 18093836544.

The previous prime is 31240140319. The next prime is 31240140341. The reversal of 31240140321 is 12304104213.

It is not a de Polignac number, because 31240140321 - 2¹ = 31240140319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31240140301) 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, 23559021 + ... + 23560346.

It is an arithmetic number, because the mean of its divisors is an integer number (2968520184).

Almost surely, 2^31240140321 is an apocalyptic number.

It is an amenable number.

31240140321 is a deficient number, since it is larger than the sum of its proper divisors (16256182623).

31240140321 is a wasteful number, since it uses less digits than its factorization.

31240140321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47119400.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31240140321 its reverse (12304104213), we get a palindrome (43544244534).

The spelling of 31240140321 in words is "thirty-one billion, two hundred forty million, one hundred forty thousand, three hundred twenty-one".