220112012110021 has 4 divisors (see below), whose sum is σ = 220471085539852. Its totient is φ = 219752938680192.

The previous prime is 220112012109973. The next prime is 220112012110093. The reversal of 220112012110021 is 120011210211022.

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

It can be written as a sum of positive squares in 2 ways, for example, as 72827210260996 + 147284801849025 = 8533886^2 + 12136095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220112012110021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220112012109977 and 220112012110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220112012110321) 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, 179536713996 + ... + 179536715221.

It is an arithmetic number, because the mean of its divisors is an integer number (55117771384963).

Almost surely, 2^{220112012110021} is an apocalyptic number.

It is an amenable number.

220112012110021 is a deficient number, since it is larger than the sum of its proper divisors (359073429831).

220112012110021 is an equidigital number, since it uses as much as digits as its factorization.

220112012110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359073429830.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 220112012110021 its reverse (120011210211022), we get a palindrome (340123222321043).

The spelling of 220112012110021 in words is "two hundred twenty trillion, one hundred twelve billion, twelve million, one hundred ten thousand, twenty-one".