13521121357 has 2 divisors, whose sum is σ = 13521121358. Its totient is φ = 13521121356.

The previous prime is 13521121331. The next prime is 13521121363. The reversal of 13521121357 is 75312112531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13497560041 + 23561316 = 116179^2 + 4854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13521121357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13521121157) 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, 6760560678 + 6760560679.

It is an arithmetic number, because the mean of its divisors is an integer number (6760560679).

Almost surely, 2^13521121357 is an apocalyptic number.

It is an amenable number.

13521121357 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521121357 is an equidigital number, since it uses as much as digits as its factorization.

13521121357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 31.

Adding to 13521121357 its reverse (75312112531), we get a palindrome (88833233888).

The spelling of 13521121357 in words is "thirteen billion, five hundred twenty-one million, one hundred twenty-one thousand, three hundred fifty-seven".