31240420211 has 24 divisors (see below), whose sum is σ = 42262960992. Its totient is φ = 22470624000.

The previous prime is 31240420193. The next prime is 31240420231. The reversal of 31240420211 is 11202404213.

It is not a de Polignac number, because 31240420211 - 2¹⁴ = 31240403827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31240420231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1407590 + ... + 1429611.

It is an arithmetic number, because the mean of its divisors is an integer number (1760956708).

Almost surely, 2^31240420211 is an apocalyptic number.

31240420211 is a deficient number, since it is larger than the sum of its proper divisors (11022540781).

31240420211 is a wasteful number, since it uses less digits than its factorization.

31240420211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837243 (or 2837232 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31240420211 its reverse (11202404213), we get a palindrome (42442824424).

It can be divided in two parts, 312404202 and 11, that added together give a palindrome (312404213).

The spelling of 31240420211 in words is "thirty-one billion, two hundred forty million, four hundred twenty thousand, two hundred eleven".