16252421 has 8 divisors (see below), whose sum is σ = 17026944. Its totient is φ = 15483600.

The previous prime is 16252403. The next prime is 16252427. The reversal of 16252421 is 12425261.

It is a happy number.

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

It is not a de Polignac number, because 16252421 - 2¹⁸ = 15990277 is a prime.

It is a super-2 number, since 2×16252421² = 528282376722482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16252427) 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, 5096 + ... + 7646.

It is an arithmetic number, because the mean of its divisors is an integer number (2128368).

Almost surely, 2^16252421 is an apocalyptic number.

It is an amenable number.

16252421 is a deficient number, since it is larger than the sum of its proper divisors (774523).

16252421 is a wasteful number, since it uses less digits than its factorization.

16252421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851.

The product of its digits is 960, while the sum is 23.

The square root of 16252421 is about 4031.4291510580. The cubic root of 16252421 is about 253.3024290941.

Adding to 16252421 its reverse (12425261), we get a palindrome (28677682).

The spelling of 16252421 in words is "sixteen million, two hundred fifty-two thousand, four hundred twenty-one".