221221031130 has 96 divisors (see below), whose sum is σ = 627551271360. Its totient is φ = 53621821440.

The previous prime is 221221031099. The next prime is 221221031147. The reversal of 221221031130 is 31130122122.

It is a super-2 number, since 2×221221031130² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10859034 + ... + 10879386.

It is an arithmetic number, because the mean of its divisors is an integer number (6536992410).

Almost surely, 2^221221031130 is an apocalyptic number.

221221031130 is an abundant number, since it is smaller than the sum of its proper divisors (406330240230).

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

221221031130 is a wasteful number, since it uses less digits than its factorization.

221221031130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31356 (or 31353 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221221031130 its reverse (31130122122), we get a palindrome (252351153252).

The spelling of 221221031130 in words is "two hundred twenty-one billion, two hundred twenty-one million, thirty-one thousand, one hundred thirty".