22121012002021 has 2 divisors, whose sum is σ = 22121012002022. Its totient is φ = 22121012002020.

The previous prime is 22121012001997. The next prime is 22121012002043. The reversal of 22121012002021 is 12020021012122.

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., 15508986041025 + 6612025960996 = 3938145^2 + 2571386^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121012002021 - 2¹⁵ = 22121011969253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121012001986 and 22121012002004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121012003021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060506001010 + 11060506001011.

It is an arithmetic number, because the mean of its divisors is an integer number (11060506001011).

Almost surely, 2^{22121012002021} is an apocalyptic number.

It is an amenable number.

22121012002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121012002021 is an equidigital number, since it uses as much as digits as its factorization.

22121012002021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121012002021 its reverse (12020021012122), we get a palindrome (34141033014143).

The spelling of 22121012002021 in words is "twenty-two trillion, one hundred twenty-one billion, twelve million, two thousand, twenty-one".