220021021221 has 16 divisors (see below), whose sum is σ = 311437512000. Its totient is φ = 137688139008.

The previous prime is 220021021169. The next prime is 220021021223. The reversal of 220021021221 is 122120120022.

It is not a de Polignac number, because 220021021221 - 2⁷ = 220021021093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220021021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021021223) 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, 5672146 + ... + 5710803.

It is an arithmetic number, because the mean of its divisors is an integer number (19464844500).

Almost surely, 2^220021021221 is an apocalyptic number.

It is an amenable number.

220021021221 is a deficient number, since it is larger than the sum of its proper divisors (91416490779).

220021021221 is a wasteful number, since it uses less digits than its factorization.

220021021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11383348.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 220021021221 its reverse (122120120022), we get a palindrome (342141141243).

The spelling of 220021021221 in words is "two hundred twenty billion, twenty-one million, twenty-one thousand, two hundred twenty-one".