20022121222221 has 16 divisors (see below), whose sum is σ = 26879810116544. Its totient is φ = 13256570502144.

The previous prime is 20022121222189. The next prime is 20022121222273. The reversal of 20022121222221 is 12222212122002.

It is not a de Polignac number, because 20022121222221 - 2⁵ = 20022121222189 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 (20022121222921) 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, 38985940 + ... + 39496173.

It is an arithmetic number, because the mean of its divisors is an integer number (1679988132284).

Almost surely, 2^{20022121222221} is an apocalyptic number.

It is an amenable number.

20022121222221 is a deficient number, since it is larger than the sum of its proper divisors (6857688894323).

20022121222221 is a wasteful number, since it uses less digits than its factorization.

20022121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78482700.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 20022121222221 its reverse (12222212122002), we get a palindrome (32244333344223).

The spelling of 20022121222221 in words is "twenty trillion, twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".