135415521100121 has 2 divisors, whose sum is σ = 135415521100122. Its totient is φ = 135415521100120.

The previous prime is 135415521100109. The next prime is 135415521100147. The reversal of 135415521100121 is 121001125514531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71128223400025 + 64287297700096 = 8433755^2 + 8017936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135415521100121 is a prime.

It is a super-2 number, since 2×135415521100121² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135415521100421) 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, 67707760550060 + 67707760550061.

It is an arithmetic number, because the mean of its divisors is an integer number (67707760550061).

Almost surely, 2^{135415521100121} is an apocalyptic number.

It is an amenable number.

135415521100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

135415521100121 is an equidigital number, since it uses as much as digits as its factorization.

135415521100121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 32.

Adding to 135415521100121 its reverse (121001125514531), we get a palindrome (256416646614652).

The spelling of 135415521100121 in words is "one hundred thirty-five trillion, four hundred fifteen billion, five hundred twenty-one million, one hundred thousand, one hundred twenty-one".