31222233121 has 16 divisors (see below), whose sum is σ = 32465231568. Its totient is φ = 30005248000.

The previous prime is 31222233109. The next prime is 31222233127. The reversal of 31222233121 is 12133222213.

It can be written as a sum of positive squares in 8 ways, for example, as 8831300625 + 22390932496 = 93975^2 + 149636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31222233121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31222233092 and 31222233101.

It is not an unprimeable number, because it can be changed into a prime (31222233127) 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, 796641 + ... + 834913.

It is an arithmetic number, because the mean of its divisors is an integer number (2029076973).

Almost surely, 2^31222233121 is an apocalyptic number.

It is an amenable number.

31222233121 is a deficient number, since it is larger than the sum of its proper divisors (1242998447).

31222233121 is a wasteful number, since it uses less digits than its factorization.

31222233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38612.

The product of its digits is 864, while the sum is 22.

Adding to 31222233121 its reverse (12133222213), we get a palindrome (43355455334).

The spelling of 31222233121 in words is "thirty-one billion, two hundred twenty-two million, two hundred thirty-three thousand, one hundred twenty-one".