220112212100021 has 4 divisors (see below), whose sum is σ = 220116263473344. Its totient is φ = 220108160726700.

The previous prime is 220112212099981. The next prime is 220112212100051. The reversal of 220112212100021 is 120001212211022.

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-220112212100021 is a prime.

It is a super-2 number, since 2×220112212100021² (a number of 29 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 (220112212100051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025605165 + ... + 2025713826.

It is an arithmetic number, because the mean of its divisors is an integer number (55029065868336).

Almost surely, 2^{220112212100021} is an apocalyptic number.

It is an amenable number.

220112212100021 is a deficient number, since it is larger than the sum of its proper divisors (4051373323).

220112212100021 is an equidigital number, since it uses as much as digits as its factorization.

220112212100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051373322.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 220112212100021 its reverse (120001212211022), we get a palindrome (340113424311043).

The spelling of 220112212100021 in words is "two hundred twenty trillion, one hundred twelve billion, two hundred twelve million, one hundred thousand, twenty-one".