31012243221 has 16 divisors (see below), whose sum is σ = 41446476288. Its totient is φ = 20626460400.

The previous prime is 31012243193. The next prime is 31012243313. The reversal of 31012243221 is 12234221013.

It is not a de Polignac number, because 31012243221 - 2¹⁴ = 31012226837 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012243321) 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, 4445266 + ... + 4452236.

It is an arithmetic number, because the mean of its divisors is an integer number (2590404768).

Almost surely, 2^31012243221 is an apocalyptic number.

It is an amenable number.

31012243221 is a deficient number, since it is larger than the sum of its proper divisors (10434233067).

31012243221 is a wasteful number, since it uses less digits than its factorization.

31012243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232.

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

Adding to 31012243221 its reverse (12234221013), we get a palindrome (43246464234).

The spelling of 31012243221 in words is "thirty-one billion, twelve million, two hundred forty-three thousand, two hundred twenty-one".