31220221130 has 24 divisors (see below), whose sum is σ = 65371321188. Its totient is φ = 10704075648.

The previous prime is 31220221099. The next prime is 31220221133. The reversal of 31220221130 is 3112202213.

It can be written as a sum of positive squares in 2 ways, for example, as 27874639849 + 3345581281 = 166957^2 + 57841^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31220221099 and 31220221108.

It is not an unprimeable number, because it can be changed into a prime (31220221133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31856879 + ... + 31857858.

Almost surely, 2^31220221130 is an apocalyptic number.

31220221130 is an abundant number, since it is smaller than the sum of its proper divisors (34151100058).

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

31220221130 is a wasteful number, since it uses less digits than its factorization.

31220221130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63714758 (or 63714751 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31220221130 its reverse (3112202213), we get a palindrome (34332423343).

The spelling of 31220221130 in words is "thirty-one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred thirty".