221021220122 has 8 divisors (see below), whose sum is σ = 331542729396. Its totient is φ = 110506976992.

The previous prime is 221021220109. The next prime is 221021220139. The reversal of 221021220122 is 221022120122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 215454717241 + 5566502881 = 464171^2 + 74609^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221021220122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1739843 + ... + 1862550.

Almost surely, 2^221021220122 is an apocalyptic number.

221021220122 is a deficient number, since it is larger than the sum of its proper divisors (110521509274).

221021220122 is a wasteful number, since it uses less digits than its factorization.

221021220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633072.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221021220122 its reverse (221022120122), we get a palindrome (442043340244).

The spelling of 221021220122 in words is "two hundred twenty-one billion, twenty-one million, two hundred twenty thousand, one hundred twenty-two".