20112101222221 has 4 divisors (see below), whose sum is σ = 20196252273600. Its totient is φ = 20027950170844.

The previous prime is 20112101222203. The next prime is 20112101222303. The reversal of 20112101222221 is 12222210121102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20112101222221 - 2⁵ = 20112101222189 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 (20112101222201) 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, 42075525331 + ... + 42075525808.

It is an arithmetic number, because the mean of its divisors is an integer number (5049063068400).

Almost surely, 2^{20112101222221} is an apocalyptic number.

It is an amenable number.

20112101222221 is a deficient number, since it is larger than the sum of its proper divisors (84151051379).

20112101222221 is an equidigital number, since it uses as much as digits as its factorization.

20112101222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84151051378.

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

Adding to 20112101222221 its reverse (12222210121102), we get a palindrome (32334311343323).

The spelling of 20112101222221 in words is "twenty trillion, one hundred twelve billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty-one".