20122121102221 has 4 divisors (see below), whose sum is σ = 20376831496000. Its totient is φ = 19867410708444.

The previous prime is 20122121102207. The next prime is 20122121102267. The reversal of 20122121102221 is 12220112122102.

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 20122121102221 - 2¹³ = 20122121094029 is a prime.

It is a super-2 number, since 2×20122121102221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122121102021) 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, 127355196771 + ... + 127355196928.

It is an arithmetic number, because the mean of its divisors is an integer number (5094207874000).

Almost surely, 2^{20122121102221} is an apocalyptic number.

It is an amenable number.

20122121102221 is a deficient number, since it is larger than the sum of its proper divisors (254710393779).

20122121102221 is an equidigital number, since it uses as much as digits as its factorization.

20122121102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254710393778.

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

Adding to 20122121102221 its reverse (12220112122102), we get a palindrome (32342233224323).

The spelling of 20122121102221 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-one".