15421099 has 4 divisors (see below), whose sum is σ = 15470064. Its totient is φ = 15372136.

The previous prime is 15421093. The next prime is 15421111. The reversal of 15421099 is 99012451.

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 15421099 - 2¹³ = 15412907 is a prime.

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 15421099.

It is not an unprimeable number, because it can be changed into a prime (15421093) 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, 24007 + ... + 24640.

It is an arithmetic number, because the mean of its divisors is an integer number (3867516).

Almost surely, 2^15421099 is an apocalyptic number.

15421099 is a deficient number, since it is larger than the sum of its proper divisors (48965).

15421099 is an equidigital number, since it uses as much as digits as its factorization.

15421099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48964.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 15421099 is about 3926.9707154498. The cubic root of 15421099 is about 248.9077630230.

The spelling of 15421099 in words is "fifteen million, four hundred twenty-one thousand, ninety-nine".