15421405345 has 4 divisors (see below), whose sum is σ = 18505686420. Its totient is φ = 12337124272.

The previous prime is 15421405291. The next prime is 15421405357. The reversal of 15421405345 is 54350412451.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2859254784 + 12562150561 = 53472^2 + 112081^2 .

It is a cyclic number.

It is not a de Polignac number, because 15421405345 - 2¹¹ = 15421403297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15421405345.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1542140530 + ... + 1542140539.

It is an arithmetic number, because the mean of its divisors is an integer number (4626421605).

Almost surely, 2^15421405345 is an apocalyptic number.

It is an amenable number.

15421405345 is a deficient number, since it is larger than the sum of its proper divisors (3084281075).

15421405345 is an equidigital number, since it uses as much as digits as its factorization.

15421405345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084281074.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 15421405345 its reverse (54350412451), we get a palindrome (69771817796).

The spelling of 15421405345 in words is "fifteen billion, four hundred twenty-one million, four hundred five thousand, three hundred forty-five".