16221963 has 4 divisors (see below), whose sum is σ = 21629288. Its totient is φ = 10814640.

The previous prime is 16221929. The next prime is 16221971. The reversal of 16221963 is 36912261.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16221963 - 2²⁰ = 15173387 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 16221963.

It is not an unprimeable number, because it can be changed into a prime (16221983) 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, 2703658 + ... + 2703663.

It is an arithmetic number, because the mean of its divisors is an integer number (5407322).

Almost surely, 2^16221963 is an apocalyptic number.

16221963 is a deficient number, since it is larger than the sum of its proper divisors (5407325).

16221963 is an equidigital number, since it uses as much as digits as its factorization.

16221963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5407324.

The product of its digits is 3888, while the sum is 30.

The square root of 16221963 is about 4027.6498109940. The cubic root of 16221963 is about 253.1440955568.

The spelling of 16221963 in words is "sixteen million, two hundred twenty-one thousand, nine hundred sixty-three".