15121144243451 has 4 divisors (see below), whose sum is σ = 15406448851872. Its totient is φ = 14835839635032.

The previous prime is 15121144243433. The next prime is 15121144243477. The reversal of 15121144243451 is 15434244112151.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15121144243451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15121144243651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142652304131 + ... + 142652304236.

It is an arithmetic number, because the mean of its divisors is an integer number (3851612212968).

Almost surely, 2^{15121144243451} is an apocalyptic number.

15121144243451 is a deficient number, since it is larger than the sum of its proper divisors (285304608421).

15121144243451 is an equidigital number, since it uses as much as digits as its factorization.

15121144243451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285304608420.

The product of its digits is 76800, while the sum is 38.

The spelling of 15121144243451 in words is "fifteen trillion, one hundred twenty-one billion, one hundred forty-four million, two hundred forty-three thousand, four hundred fifty-one".