221212121111022 has 32 divisors (see below), whose sum is σ = 444299404861440. Its totient is φ = 73424879952480.

The previous prime is 221212121110997. The next prime is 221212121111027. The reversal of 221212121111022 is 220111121212122.

It is a self number, because there is not a number n which added to its sum of digits gives 221212121111022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212121111027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22427763 + ... + 30747825.

It is an arithmetic number, because the mean of its divisors is an integer number (13884356401920).

Almost surely, 2^{221212121111022} is an apocalyptic number.

221212121111022 is an abundant number, since it is smaller than the sum of its proper divisors (223087283750418).

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

221212121111022 is a wasteful number, since it uses less digits than its factorization.

221212121111022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8338848.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221212121111022 its reverse (220111121212122), we get a palindrome (441323242323144).

The spelling of 221212121111022 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, twenty-two".