221323210122 has 32 divisors (see below), whose sum is σ = 508805811072. Its totient is φ = 62869679424.

The previous prime is 221323210117. The next prime is 221323210123. The reversal of 221323210122 is 221012323122.

221323210122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (221323210123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15222793 + ... + 15237324.

It is an arithmetic number, because the mean of its divisors is an integer number (15900181596).

Almost surely, 2^221323210122 is an apocalyptic number.

221323210122 is an abundant number, since it is smaller than the sum of its proper divisors (287482600950).

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

221323210122 is a wasteful number, since it uses less digits than its factorization.

221323210122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30460302.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221323210122 its reverse (221012323122), we get a palindrome (442335533244).

The spelling of 221323210122 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred ten thousand, one hundred twenty-two".