31221331221011 has 2 divisors, whose sum is σ = 31221331221012. Its totient is φ = 31221331221010.

The previous prime is 31221331220951. The next prime is 31221331221053. The reversal of 31221331221011 is 11012213312213.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31221331221011 - 2²⁶ = 31221264112147 is a prime.

It is not a weakly prime, because it can be changed into another prime (31221331223011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610665610505 + 15610665610506.

It is an arithmetic number, because the mean of its divisors is an integer number (15610665610506).

Almost surely, 2^{31221331221011} is an apocalyptic number.

31221331221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221331221011 is an equidigital number, since it uses as much as digits as its factorization.

31221331221011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31221331221011 its reverse (11012213312213), we get a palindrome (42233544533224).

The spelling of 31221331221011 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred twenty-one thousand, eleven".