31101221023 has 16 divisors (see below), whose sum is σ = 33287889600. Its totient is φ = 28991632384.

The previous prime is 31101220999. The next prime is 31101221059. The reversal of 31101221023 is 32012210113.

It is a cyclic number.

It is not a de Polignac number, because 31101221023 - 2⁵ = 31101220991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31101220988 and 31101221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31101221323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96015 + ... + 267247.

It is an arithmetic number, because the mean of its divisors is an integer number (2080493100).

Almost surely, 2^31101221023 is an apocalyptic number.

31101221023 is a deficient number, since it is larger than the sum of its proper divisors (2186668577).

31101221023 is a wasteful number, since it uses less digits than its factorization.

31101221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171458.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31101221023 its reverse (32012210113), we get a palindrome (63113431136).

The spelling of 31101221023 in words is "thirty-one billion, one hundred one million, two hundred twenty-one thousand, twenty-three".