16276421 has 4 divisors (see below), whose sum is σ = 18601632. Its totient is φ = 13951212.

The previous prime is 16276391. The next prime is 16276427. The reversal of 16276421 is 12467261.

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 a cyclic number.

It is not a de Polignac number, because 16276421 - 2¹⁸ = 16014277 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16276427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162595 + ... + 1162608.

It is an arithmetic number, because the mean of its divisors is an integer number (4650408).

Almost surely, 2^16276421 is an apocalyptic number.

It is an amenable number.

16276421 is a deficient number, since it is larger than the sum of its proper divisors (2325211).

16276421 is an equidigital number, since it uses as much as digits as its factorization.

16276421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325210.

The product of its digits is 4032, while the sum is 29.

The square root of 16276421 is about 4034.4046648793. The cubic root of 16276421 is about 253.4270519289.

The spelling of 16276421 in words is "sixteen million, two hundred seventy-six thousand, four hundred twenty-one".