20022222221 has 16 divisors (see below), whose sum is σ = 20601060480. Its totient is φ = 19454223360.

The previous prime is 20022222163. The next prime is 20022222239. The reversal of 20022222221 is 12222222002.

It is a cyclic number.

It is not a de Polignac number, because 20022222221 - 2²² = 20018027917 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 20022222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022222251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1192541 + ... + 1209213.

It is an arithmetic number, because the mean of its divisors is an integer number (1287566280).

Almost surely, 2^20022222221 is an apocalyptic number.

It is an amenable number.

20022222221 is a deficient number, since it is larger than the sum of its proper divisors (578838259).

20022222221 is a wasteful number, since it uses less digits than its factorization.

20022222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16996.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 20022222221 its reverse (12222222002), we get a palindrome (32244444223).

The spelling of 20022222221 in words is "twenty billion, twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".