2212121201021 has 2 divisors, whose sum is σ = 2212121201022. Its totient is φ = 2212121201020.

The previous prime is 2212121200909. The next prime is 2212121201041. The reversal of 2212121201021 is 1201021212122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2001265744921 + 210855456100 = 1414661^2 + 459190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212121201021 - 2²² = 2212117006717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212121201041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106060600510 + 1106060600511.

It is an arithmetic number, because the mean of its divisors is an integer number (1106060600511).

Almost surely, 2^{2212121201021} is an apocalyptic number.

It is an amenable number.

2212121201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212121201021 is an equidigital number, since it uses as much as digits as its factorization.

2212121201021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2212121201021 its reverse (1201021212122), we get a palindrome (3413142413143).

It can be divided in two parts, 2212121 and 201021, that added together give a palindrome (2413142).

The spelling of 2212121201021 in words is "two trillion, two hundred twelve billion, one hundred twenty-one million, two hundred one thousand, twenty-one".