2221110110021 has 12 divisors (see below), whose sum is σ = 2456935739916. Its totient is φ = 2006329902720.

The previous prime is 2221110110017. The next prime is 2221110110029. The reversal of 2221110110021 is 1200110111222.

It can be written as a sum of positive squares in 2 ways, for example, as 1494335104900 + 726775005121 = 1222430^2 + 852511^2 .

It is not a de Polignac number, because 2221110110021 - 2² = 2221110110017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221110109978 and 2221110110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221110110029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58440500 + ... + 58478493.

It is an arithmetic number, because the mean of its divisors is an integer number (204744644993).

Almost surely, 2^{2221110110021} is an apocalyptic number.

It is an amenable number.

2221110110021 is a deficient number, since it is larger than the sum of its proper divisors (235825629895).

2221110110021 is a wasteful number, since it uses less digits than its factorization.

2221110110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116919172 (or 116919161 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2221110110021 its reverse (1200110111222), we get a palindrome (3421220221243).

The spelling of 2221110110021 in words is "two trillion, two hundred twenty-one billion, one hundred ten million, one hundred ten thousand, twenty-one".