31323323023021 has 4 divisors (see below), whose sum is σ = 31394030298912. Its totient is φ = 31252615747132.

The previous prime is 31323323022967. The next prime is 31323323023081. The reversal of 31323323023021 is 12032032332313.

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-31323323023021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323323023081) 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, 35353637281 + ... + 35353638166.

It is an arithmetic number, because the mean of its divisors is an integer number (7848507574728).

Almost surely, 2^{31323323023021} is an apocalyptic number.

It is an amenable number.

31323323023021 is a deficient number, since it is larger than the sum of its proper divisors (70707275891).

31323323023021 is an equidigital number, since it uses as much as digits as its factorization.

31323323023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70707275890.

The product of its (nonzero) digits is 11664, while the sum is 28.

Adding to 31323323023021 its reverse (12032032332313), we get a palindrome (43355355355334).

The spelling of 31323323023021 in words is "thirty-one trillion, three hundred twenty-three billion, three hundred twenty-three million, twenty-three thousand, twenty-one".