20122111122221 has 4 divisors (see below), whose sum is σ = 20187655458432. Its totient is φ = 20056566786012.

The previous prime is 20122111122203. The next prime is 20122111122227. The reversal of 20122111122221 is 12222111122102.

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 a de Polignac number, because none of the positive numbers 2^k-20122111122221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122111122193 and 20122111122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122111122227) 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, 32772167645 + ... + 32772168258.

It is an arithmetic number, because the mean of its divisors is an integer number (5046913864608).

Almost surely, 2^{20122111122221} is an apocalyptic number.

It is an amenable number.

20122111122221 is a deficient number, since it is larger than the sum of its proper divisors (65544336211).

20122111122221 is an equidigital number, since it uses as much as digits as its factorization.

20122111122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65544336210.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20122111122221 its reverse (12222111122102), we get a palindrome (32344222244323).

The spelling of 20122111122221 in words is "twenty trillion, one hundred twenty-two billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".