16311421 has 4 divisors (see below), whose sum is σ = 18641632. Its totient is φ = 13981212.

The previous prime is 16311419. The next prime is 16311467. The reversal of 16311421 is 12411361.

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 not a de Polignac number, because 16311421 - 2¹ = 16311419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16311521) 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, 1165095 + ... + 1165108.

It is an arithmetic number, because the mean of its divisors is an integer number (4660408).

Almost surely, 2^16311421 is an apocalyptic number.

It is an amenable number.

16311421 is a deficient number, since it is larger than the sum of its proper divisors (2330211).

16311421 is an equidigital number, since it uses as much as digits as its factorization.

16311421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330210.

The product of its digits is 144, while the sum is 19.

The square root of 16311421 is about 4038.7400262953. The cubic root of 16311421 is about 253.6085741561.

Adding to 16311421 its reverse (12411361), we get a palindrome (28722782).

The spelling of 16311421 in words is "sixteen million, three hundred eleven thousand, four hundred twenty-one".