31223221421 has 8 divisors (see below), whose sum is σ = 36834768384. Its totient is φ = 25899446160.

The previous prime is 31223221397. The next prime is 31223221423. The reversal of 31223221421 is 12412232213.

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

It is not a de Polignac number, because 31223221421 - 2¹⁰ = 31223220397 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 (31223221423) 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, 71942690 + ... + 71943123.

It is an arithmetic number, because the mean of its divisors is an integer number (4604346048).

Almost surely, 2^31223221421 is an apocalyptic number.

31223221421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31223221421 is a deficient number, since it is larger than the sum of its proper divisors (5611546963).

31223221421 is a wasteful number, since it uses less digits than its factorization.

31223221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143885851.

The product of its digits is 1152, while the sum is 23.

Adding to 31223221421 its reverse (12412232213), we get a palindrome (43635453634).

The spelling of 31223221421 in words is "thirty-one billion, two hundred twenty-three million, two hundred twenty-one thousand, four hundred twenty-one".