31101220023 has 32 divisors (see below), whose sum is σ = 43912627200. Its totient is φ = 19525372416.

The previous prime is 31101220021. The next prime is 31101220039. The reversal of 31101220023 is 32002210113.

It is not a de Polignac number, because 31101220023 - 2¹ = 31101220021 is a prime.

It is a super-2 number, since 2×31101220023² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31101219984 and 31101220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31101220021) 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 31 ways as a sum of consecutive naturals, for example, 9547411 + ... + 9550667.

It is an arithmetic number, because the mean of its divisors is an integer number (1372269600).

Almost surely, 2^31101220023 is an apocalyptic number.

31101220023 is a deficient number, since it is larger than the sum of its proper divisors (12811407177).

31101220023 is a wasteful number, since it uses less digits than its factorization.

31101220023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4231.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31101220023 its reverse (32002210113), we get a palindrome (63103430136).

The spelling of 31101220023 in words is "thirty-one billion, one hundred one million, two hundred twenty thousand, twenty-three".