15357418121 has 4 divisors (see below), whose sum is σ = 15370423044. Its totient is φ = 15344413200.

The previous prime is 15357418117. The next prime is 15357418127. The reversal of 15357418121 is 12181475351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12181475351 = 11393 ⋅1069207.

It can be written as a sum of positive squares in 2 ways, for example, as 6439260025 + 8918158096 = 80245^2 + 94436^2 .

It is a cyclic number.

It is not a de Polignac number, because 15357418121 - 2² = 15357418117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15357418127) 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 in 3 ways as a sum of consecutive naturals, for example, 6500690 + ... + 6503051.

It is an arithmetic number, because the mean of its divisors is an integer number (3842605761).

Almost surely, 2^15357418121 is an apocalyptic number.

It is an amenable number.

15357418121 is a deficient number, since it is larger than the sum of its proper divisors (13004923).

15357418121 is a wasteful number, since it uses less digits than its factorization.

15357418121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13004922.

The product of its digits is 33600, while the sum is 38.

The spelling of 15357418121 in words is "fifteen billion, three hundred fifty-seven million, four hundred eighteen thousand, one hundred twenty-one".