2212121221157 has 2 divisors, whose sum is σ = 2212121221158. Its totient is φ = 2212121221156.

The previous prime is 2212121221111. The next prime is 2212121221237. The reversal of 2212121221157 is 7511221212122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1704993508516 + 507127712641 = 1305754^2 + 712129^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212121221157 - 2¹⁴ = 2212121204773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212121220157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106060610578 + 1106060610579.

It is an arithmetic number, because the mean of its divisors is an integer number (1106060610579).

Almost surely, 2^{2212121221157} is an apocalyptic number.

It is an amenable number.

2212121221157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212121221157 is an equidigital number, since it uses as much as digits as its factorization.

2212121221157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 29.

Adding to 2212121221157 its reverse (7511221212122), we get a palindrome (9723342433279).

The spelling of 2212121221157 in words is "two trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred fifty-seven".