31332223021 has 16 divisors (see below), whose sum is σ = 34926870528. Its totient is φ = 27862614000.

The previous prime is 31332223019. The next prime is 31332223051. The reversal of 31332223021 is 12032223313.

It is a cyclic number.

It is not a de Polignac number, because 31332223021 - 2¹ = 31332223019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31332222983 and 31332223001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31332223051) 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, 993136 + ... + 1024198.

It is an arithmetic number, because the mean of its divisors is an integer number (2182929408).

Almost surely, 2^31332223021 is an apocalyptic number.

It is an amenable number.

31332223021 is a deficient number, since it is larger than the sum of its proper divisors (3594647507).

31332223021 is a wasteful number, since it uses less digits than its factorization.

31332223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33072.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31332223021 its reverse (12032223313), we get a palindrome (43364446334).

The spelling of 31332223021 in words is "thirty-one billion, three hundred thirty-two million, two hundred twenty-three thousand, twenty-one".