2221000001021 has 2 divisors, whose sum is σ = 2221000001022. Its totient is φ = 2221000001020.

The previous prime is 2221000000991. The next prime is 2221000001023. The reversal of 2221000001021 is 1201000001222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1636365432025 + 584634568996 = 1279205^2 + 764614^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221000001021 - 2⁶ = 2221000000957 is a prime.

Together with 2221000001023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2221000000993 and 2221000001011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221000001023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110500000510 + 1110500000511.

It is an arithmetic number, because the mean of its divisors is an integer number (1110500000511).

Almost surely, 2^{2221000001021} is an apocalyptic number.

It is an amenable number.

2221000001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221000001021 is an equidigital number, since it uses as much as digits as its factorization.

2221000001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2221000001021 its reverse (1201000001222), we get a palindrome (3422000002243).

The spelling of 2221000001021 in words is "two trillion, two hundred twenty-one billion, one thousand, twenty-one".