16421923 has 4 divisors (see below), whose sum is σ = 18767920. Its totient is φ = 14075928.

The previous prime is 16421897. The next prime is 16421963. The reversal of 16421923 is 32912461.

16421923 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32912461 = 149 ⋅220889.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421923 is a prime.

It is a Duffinian number.

16421923 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 16421891 and 16421900.

It is not an unprimeable number, because it can be changed into a prime (16421963) 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, 1172988 + ... + 1173001.

It is an arithmetic number, because the mean of its divisors is an integer number (4691980).

Almost surely, 2^16421923 is an apocalyptic number.

16421923 is a deficient number, since it is larger than the sum of its proper divisors (2345997).

16421923 is an equidigital number, since it uses as much as digits as its factorization.

16421923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345996.

The product of its digits is 2592, while the sum is 28.

The square root of 16421923 is about 4052.3971917866. The cubic root of 16421923 is about 254.1799776361.

The spelling of 16421923 in words is "sixteen million, four hundred twenty-one thousand, nine hundred twenty-three".