15421401 has 8 divisors (see below), whose sum is σ = 22846560. Its totient is φ = 10280916.

The previous prime is 15421379. The next prime is 15421409. The reversal of 15421401 is 10412451.

It is not a de Polignac number, because 15421401 - 2⁶ = 15421337 is a prime.

It is a super-3 number, since 3×15421401³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (15421409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285555 + ... + 285608.

It is an arithmetic number, because the mean of its divisors is an integer number (2855820).

Almost surely, 2^15421401 is an apocalyptic number.

It is an amenable number.

15421401 is a deficient number, since it is larger than the sum of its proper divisors (7425159).

15421401 is an equidigital number, since it uses as much as digits as its factorization.

15421401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571172 (or 571166 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 15421401 is about 3927.0091672926. The cubic root of 15421401 is about 248.9093878456.

Adding to 15421401 its reverse (10412451), we get a palindrome (25833852).

The spelling of 15421401 in words is "fifteen million, four hundred twenty-one thousand, four hundred one".