220121112221 has 4 divisors (see below), whose sum is σ = 220122669312. Its totient is φ = 220119555132.

The previous prime is 220121112199. The next prime is 220121112227. The reversal of 220121112221 is 122211121022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220121112221 - 2⁶ = 220121112157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220121112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121112227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542675 + ... + 857168.

It is an arithmetic number, because the mean of its divisors is an integer number (55030667328).

Almost surely, 2^220121112221 is an apocalyptic number.

It is an amenable number.

220121112221 is a deficient number, since it is larger than the sum of its proper divisors (1557091).

220121112221 is a wasteful number, since it uses less digits than its factorization.

220121112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557090.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 220121112221 its reverse (122211121022), we get a palindrome (342332233243).

The spelling of 220121112221 in words is "two hundred twenty billion, one hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".