220111012021 has 4 divisors (see below), whose sum is σ = 223841707200. Its totient is φ = 216380316844.

The previous prime is 220111012007. The next prime is 220111012049. The reversal of 220111012021 is 120210111022.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120210111022 = 2 ⋅60105055511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220111012021 is a prime.

It is a super-2 number, since 2×220111012021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220111011992 and 220111012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220111012091) 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, 1865347501 + ... + 1865347618.

It is an arithmetic number, because the mean of its divisors is an integer number (55960426800).

Almost surely, 2^220111012021 is an apocalyptic number.

It is an amenable number.

220111012021 is a deficient number, since it is larger than the sum of its proper divisors (3730695179).

220111012021 is an equidigital number, since it uses as much as digits as its factorization.

220111012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3730695178.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 220111012021 its reverse (120210111022), we get a palindrome (340321123043).

Subtracting from 220111012021 its reverse (120210111022), we obtain a palindrome (99900900999).

The spelling of 220111012021 in words is "two hundred twenty billion, one hundred eleven million, twelve thousand, twenty-one".