15421057 has 8 divisors (see below), whose sum is σ = 16488576. Its totient is φ = 14371392.

The previous prime is 15421033. The next prime is 15421061. The reversal of 15421057 is 75012451.

15421057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15421057 - 2¹¹ = 15419009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15425057) 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, 2653 + ... + 6154.

It is an arithmetic number, because the mean of its divisors is an integer number (2061072).

Almost surely, 2^15421057 is an apocalyptic number.

15421057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

15421057 is a deficient number, since it is larger than the sum of its proper divisors (1067519).

15421057 is a wasteful number, since it uses less digits than its factorization.

15421057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8927.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 15421057 is about 3926.9653678127. The cubic root of 15421057 is about 248.9075370526.

The spelling of 15421057 in words is "fifteen million, four hundred twenty-one thousand, fifty-seven".