15354421 has 4 divisors (see below), whose sum is σ = 15512812. Its totient is φ = 15196032.

The previous prime is 15354407. The next prime is 15354431. The reversal of 15354421 is 12445351.

It is a happy number.

15354421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10817521 + 4536900 = 3289^2 + 2130^2 .

It is a cyclic number.

It is not a de Polignac number, because 15354421 - 2⁷ = 15354293 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 (15354431) 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, 79050 + ... + 79243.

It is an arithmetic number, because the mean of its divisors is an integer number (3878203).

Almost surely, 2^15354421 is an apocalyptic number.

It is an amenable number.

15354421 is a deficient number, since it is larger than the sum of its proper divisors (158391).

15354421 is an equidigital number, since it uses as much as digits as its factorization.

15354421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158390.

The product of its digits is 2400, while the sum is 25.

The square root of 15354421 is about 3918.4717684322. The cubic root of 15354421 is about 248.5485009114.

Adding to 15354421 its reverse (12445351), we get a palindrome (27799772).

The spelling of 15354421 in words is "fifteen million, three hundred fifty-four thousand, four hundred twenty-one".