2221101121021 has 4 divisors (see below), whose sum is σ = 2230633744092. Its totient is φ = 2211568497952.

The previous prime is 2221101121003. The next prime is 2221101121037. The reversal of 2221101121021 is 1201211011222.

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 858420780100 + 1362680340921 = 926510^2 + 1167339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221101121021 - 2⁷ = 2221101120893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221101120986 and 2221101121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221101121061) 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, 4766311186 + ... + 4766311651.

It is an arithmetic number, because the mean of its divisors is an integer number (557658436023).

Almost surely, 2^{2221101121021} is an apocalyptic number.

It is an amenable number.

2221101121021 is a deficient number, since it is larger than the sum of its proper divisors (9532623071).

2221101121021 is an equidigital number, since it uses as much as digits as its factorization.

2221101121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9532623070.

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

Adding to 2221101121021 its reverse (1201211011222), we get a palindrome (3422312132243).

The spelling of 2221101121021 in words is "two trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty-one thousand, twenty-one".