31577021223 has 16 divisors (see below), whose sum is σ = 45935296896. Its totient is φ = 19135470240.

The previous prime is 31577021207. The next prime is 31577021251. The reversal of 31577021223 is 32212077513.

It is not a de Polignac number, because 31577021223 - 2⁴ = 31577021207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31577021293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281136 + ... + 377082.

It is an arithmetic number, because the mean of its divisors is an integer number (2870956056).

Almost surely, 2^31577021223 is an apocalyptic number.

31577021223 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31577021223 is a deficient number, since it is larger than the sum of its proper divisors (14358275673).

31577021223 is a wasteful number, since it uses less digits than its factorization.

31577021223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105934.

The product of its (nonzero) digits is 17640, while the sum is 33.

Adding to 31577021223 its reverse (32212077513), we get a palindrome (63789098736).

The spelling of 31577021223 in words is "thirty-one billion, five hundred seventy-seven million, twenty-one thousand, two hundred twenty-three".