2221130120021 has 2 divisors, whose sum is σ = 2221130120022. Its totient is φ = 2221130120020.

The previous prime is 2221130119903. The next prime is 2221130120023. The reversal of 2221130120021 is 1200210311222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1692835188100 + 528294931921 = 1301090^2 + 726839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221130120021 is a prime.

Together with 2221130120023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221130120023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110565060010 + 1110565060011.

It is an arithmetic number, because the mean of its divisors is an integer number (1110565060011).

Almost surely, 2^{2221130120021} is an apocalyptic number.

It is an amenable number.

2221130120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221130120021 is an equidigital number, since it uses as much as digits as its factorization.

2221130120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2221130120021 its reverse (1200210311222), we get a palindrome (3421340431243).

The spelling of 2221130120021 in words is "two trillion, two hundred twenty-one billion, one hundred thirty million, one hundred twenty thousand, twenty-one".