15434342221 has 4 divisors (see below), whose sum is σ = 15458198112. Its totient is φ = 15410486332.

The previous prime is 15434342207. The next prime is 15434342243. The reversal of 15434342221 is 12224343451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12224343451 = 43 ⋅284287057.

It is a cyclic number.

It is not a de Polignac number, because 15434342221 - 2¹³ = 15434334029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15434342201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11926975 + ... + 11928268.

It is an arithmetic number, because the mean of its divisors is an integer number (3864549528).

Almost surely, 2^15434342221 is an apocalyptic number.

It is an amenable number.

15434342221 is a deficient number, since it is larger than the sum of its proper divisors (23855891).

15434342221 is an equidigital number, since it uses as much as digits as its factorization.

15434342221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23855890.

The product of its digits is 23040, while the sum is 31.

Adding to 15434342221 its reverse (12224343451), we get a palindrome (27658685672).

The spelling of 15434342221 in words is "fifteen billion, four hundred thirty-four million, three hundred forty-two thousand, two hundred twenty-one".