2221000021021 has 4 divisors (see below), whose sum is σ = 2221024044700. Its totient is φ = 2220975997344.

The previous prime is 2221000021013. The next prime is 2221000021063. The reversal of 2221000021021 is 1201200001222.

It is a happy number.

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 2130837948121 + 90162072900 = 1459739^2 + 300270^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221000021021 - 2³ = 2221000021013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221000020992 and 2221000021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221000021081) 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, 11872626 + ... + 12058243.

It is an arithmetic number, because the mean of its divisors is an integer number (555256011175).

Almost surely, 2^{2221000021021} is an apocalyptic number.

It is an amenable number.

2221000021021 is a deficient number, since it is larger than the sum of its proper divisors (24023679).

2221000021021 is an equidigital number, since it uses as much as digits as its factorization.

2221000021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24023678.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2221000021021 its reverse (1201200001222), we get a palindrome (3422200022243).

The spelling of 2221000021021 in words is "two trillion, two hundred twenty-one billion, twenty-one thousand, twenty-one".