12562121357 has 2 divisors, whose sum is σ = 12562121358. Its totient is φ = 12562121356.

The previous prime is 12562121293. The next prime is 12562121419. The reversal of 12562121357 is 75312126521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11616312841 + 945808516 = 107779^2 + 30754^2 .

It is a cyclic number.

It is not a de Polignac number, because 12562121357 - 2⁶ = 12562121293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12562121057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6281060678 + 6281060679.

It is an arithmetic number, because the mean of its divisors is an integer number (6281060679).

Almost surely, 2^12562121357 is an apocalyptic number.

It is an amenable number.

12562121357 is a deficient number, since it is larger than the sum of its proper divisors (1).

12562121357 is an equidigital number, since it uses as much as digits as its factorization.

12562121357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 35.

Adding to 12562121357 its reverse (75312126521), we get a palindrome (87874247878).

The spelling of 12562121357 in words is "twelve billion, five hundred sixty-two million, one hundred twenty-one thousand, three hundred fifty-seven".