31221222130 has 32 divisors (see below), whose sum is σ = 65185128576. Its totient is φ = 10544649984.

The previous prime is 31221222127. The next prime is 31221222203. The reversal of 31221222130 is 3122212213.

It is a super-2 number, since 2×31221222130² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31221222098 and 31221222107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3323799 + ... + 3333178.

It is an arithmetic number, because the mean of its divisors is an integer number (2037035268).

Almost surely, 2^31221222130 is an apocalyptic number.

31221222130 is an abundant number, since it is smaller than the sum of its proper divisors (33963906446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221222130 is a wasteful number, since it uses less digits than its factorization.

31221222130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6657058.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31221222130 its reverse (3122212213), we get a palindrome (34343434343).

The spelling of 31221222130 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred thirty".