16221023 has 16 divisors (see below), whose sum is σ = 20059200. Its totient is φ = 12773376.

The previous prime is 16221017. The next prime is 16221031. The reversal of 16221023 is 32012261.

It is not a de Polignac number, because 16221023 - 2²⁰ = 15172447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16220992 and 16221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35903 + ... + 36351.

It is an arithmetic number, because the mean of its divisors is an integer number (1253700).

Almost surely, 2^16221023 is an apocalyptic number.

16221023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16221023 is a deficient number, since it is larger than the sum of its proper divisors (3838177).

16221023 is a wasteful number, since it uses less digits than its factorization.

16221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 16221023 is about 4027.5331159408. The cubic root of 16221023 is about 253.1392058887.

Adding to 16221023 its reverse (32012261), we get a palindrome (48233284).

The spelling of 16221023 in words is "sixteen million, two hundred twenty-one thousand, twenty-three".