31223324021 has 8 divisors (see below), whose sum is σ = 33274070784. Its totient is φ = 29230344880.

The previous prime is 31223323949. The next prime is 31223324081. The reversal of 31223324021 is 12042332213.

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

It is not a de Polignac number, because 31223324021 - 2³⁴ = 14043454837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223324081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14440790 + ... + 14442951.

It is an arithmetic number, because the mean of its divisors is an integer number (4159258848).

Almost surely, 2^31223324021 is an apocalyptic number.

It is an amenable number.

31223324021 is a deficient number, since it is larger than the sum of its proper divisors (2050746763).

31223324021 is a wasteful number, since it uses less digits than its factorization.

31223324021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28883811.

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

Adding to 31223324021 its reverse (12042332213), we get a palindrome (43265656234).

The spelling of 31223324021 in words is "thirty-one billion, two hundred twenty-three million, three hundred twenty-four thousand, twenty-one".