31223143120421 has 8 divisors (see below), whose sum is σ = 35687828651904. Its totient is φ = 26759516717520.

The previous prime is 31223143120399. The next prime is 31223143120439. The reversal of 31223143120421 is 12402134132213.

It is a happy number.

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 31223143120421 - 2¹⁴ = 31223143104037 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 (31223143120471) 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, 264718970 + ... + 264836891.

It is an arithmetic number, because the mean of its divisors is an integer number (4460978581488).

Almost surely, 2^{31223143120421} is an apocalyptic number.

It is an amenable number.

31223143120421 is a deficient number, since it is larger than the sum of its proper divisors (4464685531483).

31223143120421 is an equidigital number, since it uses as much as digits as its factorization.

31223143120421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529564291.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 31223143120421 its reverse (12402134132213), we get a palindrome (43625277252634).

The spelling of 31223143120421 in words is "thirty-one trillion, two hundred twenty-three billion, one hundred forty-three million, one hundred twenty thousand, four hundred twenty-one".