31022122221 has 18 divisors (see below), whose sum is σ = 45276574122. Its totient is φ = 20468148480.

The previous prime is 31022122211. The next prime is 31022122249. The reversal of 31022122221 is 12222122013.

It can be written as a sum of positive squares in 3 ways, for example, as 181845225 + 30840276996 = 13485^2 + 175614^2 .

It is not a de Polignac number, because 31022122221 - 2⁷ = 31022122093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31022122194 and 31022122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31022122211) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 98490 + ... + 267851.

It is an arithmetic number, because the mean of its divisors is an integer number (2515365229).

Almost surely, 2^31022122221 is an apocalyptic number.

It is an amenable number.

31022122221 is a deficient number, since it is larger than the sum of its proper divisors (14254451901).

31022122221 is an equidigital number, since it uses as much as digits as its factorization.

31022122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366541 (or 366441 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31022122221 its reverse (12222122013), we get a palindrome (43244244234).

The spelling of 31022122221 in words is "thirty-one billion, twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".