16452421 has 4 divisors (see below), whose sum is σ = 16578144. Its totient is φ = 16326700.

The previous prime is 16452409. The next prime is 16452433. The reversal of 16452421 is 12425461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (16452409) and next prime (16452433).

It is a cyclic number.

It is not a de Polignac number, because 16452421 - 2⁵ = 16452389 is a prime.

It is a super-2 number, since 2×16452421² = 541364313522482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16452221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62665 + ... + 62926.

It is an arithmetic number, because the mean of its divisors is an integer number (4144536).

Almost surely, 2^16452421 is an apocalyptic number.

It is an amenable number.

16452421 is a deficient number, since it is larger than the sum of its proper divisors (125723).

16452421 is a wasteful number, since it uses less digits than its factorization.

16452421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125722.

The product of its digits is 1920, while the sum is 25.

The square root of 16452421 is about 4056.1584042046. The cubic root of 16452421 is about 254.3372305764.

Adding to 16452421 its reverse (12425461), we get a palindrome (28877882).

The spelling of 16452421 in words is "sixteen million, four hundred fifty-two thousand, four hundred twenty-one".