20221220122111 has 4 divisors (see below), whose sum is σ = 21285494865400. Its totient is φ = 19156945378824.

The previous prime is 20221220122109. The next prime is 20221220122121. The reversal of 20221220122111 is 11122102212202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20221220122111 - 2¹ = 20221220122109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1064274743269 = 20221220122111 / (2 + 0 + 2 + 2 + 1 + 2 + 2 + 0 + 1 + 2 + 2 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221220122121) 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, 532137371616 + ... + 532137371653.

It is an arithmetic number, because the mean of its divisors is an integer number (5321373716350).

Almost surely, 2^{20221220122111} is an apocalyptic number.

20221220122111 is a deficient number, since it is larger than the sum of its proper divisors (1064274743289).

20221220122111 is a wasteful number, since it uses less digits than its factorization.

20221220122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064274743288.

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

Adding to 20221220122111 its reverse (11122102212202), we get a palindrome (31343322334313).

The spelling of 20221220122111 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, one hundred eleven".