15126421231 has 4 divisors (see below), whose sum is σ = 15129751000. Its totient is φ = 15123091464.

The previous prime is 15126421229. The next prime is 15126421241. The reversal of 15126421231 is 13212462151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13212462151 = 7 ⋅1887494593.

It is a cyclic number.

It is not a de Polignac number, because 15126421231 - 2¹ = 15126421229 is a prime.

It is a super-2 number, since 2×15126421231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15126421231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15126421241) 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, 1658061 + ... + 1667158.

It is an arithmetic number, because the mean of its divisors is an integer number (3782437750).

Almost surely, 2^15126421231 is an apocalyptic number.

15126421231 is a deficient number, since it is larger than the sum of its proper divisors (3329769).

15126421231 is an equidigital number, since it uses as much as digits as its factorization.

15126421231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329768.

The product of its digits is 2880, while the sum is 28.

Adding to 15126421231 its reverse (13212462151), we get a palindrome (28338883382).

The spelling of 15126421231 in words is "fifteen billion, one hundred twenty-six million, four hundred twenty-one thousand, two hundred thirty-one".