2121112223257 has 2 divisors, whose sum is σ = 2121112223258. Its totient is φ = 2121112223256.

The previous prime is 2121112223249. The next prime is 2121112223333. The reversal of 2121112223257 is 7523222111212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1859434959321 + 261677263936 = 1363611^2 + 511544^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121112223257 - 2³ = 2121112223249 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121112226257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060556111628 + 1060556111629.

It is an arithmetic number, because the mean of its divisors is an integer number (1060556111629).

Almost surely, 2^{2121112223257} is an apocalyptic number.

It is an amenable number.

2121112223257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121112223257 is an equidigital number, since it uses as much as digits as its factorization.

2121112223257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

Adding to 2121112223257 its reverse (7523222111212), we get a palindrome (9644334334469).

The spelling of 2121112223257 in words is "two trillion, one hundred twenty-one billion, one hundred twelve million, two hundred twenty-three thousand, two hundred fifty-seven".