31423223021 has 8 divisors (see below), whose sum is σ = 31505997600. Its totient is φ = 31340486320.

The previous prime is 31423223003. The next prime is 31423223071. The reversal of 31423223021 is 12032232413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31423223021 - 2²⁶ = 31356114157 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 (31423223071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2499770 + ... + 2512308.

It is an arithmetic number, because the mean of its divisors is an integer number (3938249700).

Almost surely, 2^31423223021 is an apocalyptic number.

It is an amenable number.

31423223021 is a deficient number, since it is larger than the sum of its proper divisors (82774579).

31423223021 is a wasteful number, since it uses less digits than its factorization.

31423223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18939.

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

Adding to 31423223021 its reverse (12032232413), we get a palindrome (43455455434).

The spelling of 31423223021 in words is "thirty-one billion, four hundred twenty-three million, two hundred twenty-three thousand, twenty-one".