2121002213021 has 2 divisors, whose sum is σ = 2121002213022. Its totient is φ = 2121002213020.

The previous prime is 2121002213017. The next prime is 2121002213039. The reversal of 2121002213021 is 1203122001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1332477748900 + 788524464121 = 1154330^2 + 887989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121002213021 - 2² = 2121002213017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121002210021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060501106510 + 1060501106511.

It is an arithmetic number, because the mean of its divisors is an integer number (1060501106511).

Almost surely, 2^{2121002213021} is an apocalyptic number.

It is an amenable number.

2121002213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121002213021 is an equidigital number, since it uses as much as digits as its factorization.

2121002213021 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 2121002213021 its reverse (1203122001212), we get a palindrome (3324124214233).

The spelling of 2121002213021 in words is "two trillion, one hundred twenty-one billion, two million, two hundred thirteen thousand, twenty-one".