15225421243 has 4 divisors (see below), whose sum is σ = 15228457408. Its totient is φ = 15222385080.

The previous prime is 15225421241. The next prime is 15225421273. The reversal of 15225421243 is 34212452251.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 15225421243 - 2¹ = 15225421241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15225421241) 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, 1510548 + ... + 1520593.

It is an arithmetic number, because the mean of its divisors is an integer number (3807114352).

Almost surely, 2^15225421243 is an apocalyptic number.

15225421243 is a deficient number, since it is larger than the sum of its proper divisors (3036165).

15225421243 is an equidigital number, since it uses as much as digits as its factorization.

15225421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036164.

The product of its digits is 19200, while the sum is 31.

Adding to 15225421243 its reverse (34212452251), we get a palindrome (49437873494).

The spelling of 15225421243 in words is "fifteen billion, two hundred twenty-five million, four hundred twenty-one thousand, two hundred forty-three".