31423232021 has 16 divisors (see below), whose sum is σ = 33781978944. Its totient is φ = 29121548544.

The previous prime is 31423231993. The next prime is 31423232039. The reversal of 31423232021 is 12023232413.

It is a cyclic number.

It is not a de Polignac number, because 31423232021 - 2²⁶ = 31356123157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423202021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4145591 + ... + 4153163.

It is an arithmetic number, because the mean of its divisors is an integer number (2111373684).

Almost surely, 2^31423232021 is an apocalyptic number.

It is an amenable number.

31423232021 is a deficient number, since it is larger than the sum of its proper divisors (2358746923).

31423232021 is a wasteful number, since it uses less digits than its factorization.

31423232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11300.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31423232021 its reverse (12023232413), we get a palindrome (43446464434).

The spelling of 31423232021 in words is "thirty-one billion, four hundred twenty-three million, two hundred thirty-two thousand, twenty-one".