31103313101021 has 4 divisors (see below), whose sum is σ = 35546643544032. Its totient is φ = 26659982658012.

The previous prime is 31103313100799. The next prime is 31103313101033. The reversal of 31103313101021 is 12010131330113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31103313101021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31103313100984 and 31103313101002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103313101041) 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, 2221665221495 + ... + 2221665221508.

It is an arithmetic number, because the mean of its divisors is an integer number (8886660886008).

Almost surely, 2^{31103313101021} is an apocalyptic number.

It is an amenable number.

31103313101021 is a deficient number, since it is larger than the sum of its proper divisors (4443330443011).

31103313101021 is an equidigital number, since it uses as much as digits as its factorization.

31103313101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443330443010.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 31103313101021 its reverse (12010131330113), we get a palindrome (43113444431134).

The spelling of 31103313101021 in words is "thirty-one trillion, one hundred three billion, three hundred thirteen million, one hundred one thousand, twenty-one".