20101222221121 has 16 divisors (see below), whose sum is σ = 21055083396480. Its totient is φ = 19154070777600.

The previous prime is 20101222221107. The next prime is 20101222221127. The reversal of 20101222221121 is 12112222210102.

It is a cyclic number.

It is not a de Polignac number, because 20101222221121 - 2²⁷ = 20101088003393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101222221127) 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, 16522921 + ... + 17697721.

It is an arithmetic number, because the mean of its divisors is an integer number (1315942712280).

Almost surely, 2^{20101222221121} is an apocalyptic number.

It is an amenable number.

20101222221121 is a deficient number, since it is larger than the sum of its proper divisors (953861175359).

20101222221121 is a wasteful number, since it uses less digits than its factorization.

20101222221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177656.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20101222221121 its reverse (12112222210102), we get a palindrome (32213444431223).

The spelling of 20101222221121 in words is "twenty trillion, one hundred one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".