16371405021 has 4 divisors (see below), whose sum is σ = 21828540032. Its totient is φ = 10914270012.

The previous prime is 16371405013. The next prime is 16371405023. The reversal of 16371405021 is 12050417361.

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 16371405021 - 2³ = 16371405013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16371405021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16371405023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2728567501 + ... + 2728567506.

It is an arithmetic number, because the mean of its divisors is an integer number (5457135008).

Almost surely, 2^16371405021 is an apocalyptic number.

It is an amenable number.

16371405021 is a deficient number, since it is larger than the sum of its proper divisors (5457135011).

16371405021 is an equidigital number, since it uses as much as digits as its factorization.

16371405021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5457135010.

The product of its (nonzero) digits is 5040, while the sum is 30.

The spelling of 16371405021 in words is "sixteen billion, three hundred seventy-one million, four hundred five thousand, twenty-one".