31221210423 has 16 divisors (see below), whose sum is σ = 45873027200. Its totient is φ = 18766236384.

The previous prime is 31221210403. The next prime is 31221210437. The reversal of 31221210423 is 32401212213.

It is not a de Polignac number, because 31221210423 - 2¹⁰ = 31221209399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31221210423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221210403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9306973 + ... + 9310326.

It is an arithmetic number, because the mean of its divisors is an integer number (2867064200).

Almost surely, 2^31221210423 is an apocalyptic number.

31221210423 is a deficient number, since it is larger than the sum of its proper divisors (14651816777).

31221210423 is a wasteful number, since it uses less digits than its factorization.

31221210423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18617358.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31221210423 its reverse (32401212213), we get a palindrome (63622422636).

The spelling of 31221210423 in words is "thirty-one billion, two hundred twenty-one million, two hundred ten thousand, four hundred twenty-three".