31013021011 has 4 divisors (see below), whose sum is σ = 35443452592. Its totient is φ = 26582589432.

The previous prime is 31013020963. The next prime is 31013021033. The reversal of 31013021011 is 11012031013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11012031013 = 74897 ⋅147029.

It is not a de Polignac number, because 31013021011 - 2⁹ = 31013020499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31013020982 and 31013021000.

It is not an unprimeable number, because it can be changed into a prime (31013021411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2215215780 + ... + 2215215793.

It is an arithmetic number, because the mean of its divisors is an integer number (8860863148).

Almost surely, 2^31013021011 is an apocalyptic number.

31013021011 is a deficient number, since it is larger than the sum of its proper divisors (4430431581).

31013021011 is an equidigital number, since it uses as much as digits as its factorization.

31013021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430431580.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 31013021011 its reverse (11012031013), we get a palindrome (42025052024).

The spelling of 31013021011 in words is "thirty-one billion, thirteen million, twenty-one thousand, eleven".