31612337221 has 2 divisors, whose sum is σ = 31612337222. Its totient is φ = 31612337220.

The previous prime is 31612337201. The next prime is 31612337321. The reversal of 31612337221 is 12273321613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30498780321 + 1113556900 = 174639^2 + 33370^2 .

It is a cyclic number.

It is not a de Polignac number, because 31612337221 - 2¹⁷ = 31612206149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31612337201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15806168610 + 15806168611.

It is an arithmetic number, because the mean of its divisors is an integer number (15806168611).

Almost surely, 2^31612337221 is an apocalyptic number.

It is an amenable number.

31612337221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31612337221 is an equidigital number, since it uses as much as digits as its factorization.

31612337221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

Adding to 31612337221 its reverse (12273321613), we get a palindrome (43885658834).

The spelling of 31612337221 in words is "thirty-one billion, six hundred twelve million, three hundred thirty-seven thousand, two hundred twenty-one".