221221112010 has 32 divisors (see below), whose sum is σ = 538408570752. Its totient is φ = 58161418560.

The previous prime is 221221111987. The next prime is 221221112011. The reversal of 221221112010 is 10211122122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (221221112011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51927709 + ... + 51931968.

It is an arithmetic number, because the mean of its divisors is an integer number (16825267836).

Almost surely, 2^221221112010 is an apocalyptic number.

221221112010 is an abundant number, since it is smaller than the sum of its proper divisors (317187458742).

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

221221112010 is a wasteful number, since it uses less digits than its factorization.

221221112010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103859758.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221221112010 its reverse (10211122122), we get a palindrome (231432234132).

The spelling of 221221112010 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, ten".