16425521 has 8 divisors (see below), whose sum is σ = 19279680. Its totient is φ = 13698288.

The previous prime is 16425503. The next prime is 16425533. The reversal of 16425521 is 12552461.

16425521 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 16425521 - 2⁶ = 16425457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16425221) 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, 31451 + ... + 31968.

It is an arithmetic number, because the mean of its divisors is an integer number (2409960).

Almost surely, 2^16425521 is an apocalyptic number.

It is an amenable number.

16425521 is a deficient number, since it is larger than the sum of its proper divisors (2854159).

16425521 is an equidigital number, since it uses as much as digits as its factorization.

16425521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63463.

The product of its digits is 2400, while the sum is 26.

The square root of 16425521 is about 4052.8411022393. The cubic root of 16425521 is about 254.1985396680.

Adding to 16425521 its reverse (12552461), we get a palindrome (28977982).

The spelling of 16425521 in words is "sixteen million, four hundred twenty-five thousand, five hundred twenty-one".