220100111122021 has 4 divisors (see below), whose sum is σ = 237030888900652. Its totient is φ = 203169333343392.

The previous prime is 220100111122019. The next prime is 220100111122033. The reversal of 220100111122021 is 120221111001022.

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 33417486777796 + 186682624344225 = 5780786^2 + 13663185^2 .

It is not a de Polignac number, because 220100111122021 - 2¹ = 220100111122019 is a prime.

It is a super-2 number, since 2×220100111122021² (a number of 29 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 = 220100111121986 and 220100111122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220100111122051) 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, 8465388889296 + ... + 8465388889321.

It is an arithmetic number, because the mean of its divisors is an integer number (59257722225163).

Almost surely, 2^{220100111122021} is an apocalyptic number.

It is an amenable number.

220100111122021 is a deficient number, since it is larger than the sum of its proper divisors (16930777778631).

220100111122021 is a wasteful number, since it uses less digits than its factorization.

220100111122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16930777778630.

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

Adding to 220100111122021 its reverse (120221111001022), we get a palindrome (340321222123043).

The spelling of 220100111122021 in words is "two hundred twenty trillion, one hundred billion, one hundred eleven million, one hundred twenty-two thousand, twenty-one".