16421311 has 4 divisors (see below), whose sum is σ = 16433032. Its totient is φ = 16409592.

The previous prime is 16421299. The next prime is 16421323. The reversal of 16421311 is 11312461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11312461 = 1493 ⋅7577.

It is an interprime number because it is at equal distance from previous prime (16421299) and next prime (16421323).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421311 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 (16421341) 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, 3420 + ... + 6673.

It is an arithmetic number, because the mean of its divisors is an integer number (4108258).

Almost surely, 2^16421311 is an apocalyptic number.

16421311 is a deficient number, since it is larger than the sum of its proper divisors (11721).

16421311 is a wasteful number, since it uses less digits than its factorization.

16421311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11720.

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

The square root of 16421311 is about 4052.3216802223. The cubic root of 16421311 is about 254.1768200668.

Adding to 16421311 its reverse (11312461), we get a palindrome (27733772).

The spelling of 16421311 in words is "sixteen million, four hundred twenty-one thousand, three hundred eleven".