2021212202257 has 2 divisors, whose sum is σ = 2021212202258. Its totient is φ = 2021212202256.

The previous prime is 2021212202221. The next prime is 2021212202263. The reversal of 2021212202257 is 7522022121202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1990466683921 + 30745518336 = 1410839^2 + 175344^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021212202257 - 2⁷ = 2021212202129 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021212202557) 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, 1010606101128 + 1010606101129.

It is an arithmetic number, because the mean of its divisors is an integer number (1010606101129).

Almost surely, 2^{2021212202257} is an apocalyptic number.

It is an amenable number.

2021212202257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021212202257 is an equidigital number, since it uses as much as digits as its factorization.

2021212202257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 28.

Adding to 2021212202257 its reverse (7522022121202), we get a palindrome (9543234323459).

The spelling of 2021212202257 in words is "two trillion, twenty-one billion, two hundred twelve million, two hundred two thousand, two hundred fifty-seven".