20122210202221 has 4 divisors (see below), whose sum is σ = 20122231369500. Its totient is φ = 20122189034944.

The previous prime is 20122210202209. The next prime is 20122210202299. The reversal of 20122210202221 is 12220201222102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15421721702500 + 4700488499721 = 3927050^2 + 2168061^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122210202221 - 2¹³ = 20122210194029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122210202621) 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, 9087166 + ... + 11082463.

It is an arithmetic number, because the mean of its divisors is an integer number (5030557842375).

Almost surely, 2^{20122210202221} is an apocalyptic number.

It is an amenable number.

20122210202221 is a deficient number, since it is larger than the sum of its proper divisors (21167279).

20122210202221 is an equidigital number, since it uses as much as digits as its factorization.

20122210202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21167278.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20122210202221 its reverse (12220201222102), we get a palindrome (32342411424323).

The spelling of 20122210202221 in words is "twenty trillion, one hundred twenty-two billion, two hundred ten million, two hundred two thousand, two hundred twenty-one".