16148921 has 4 divisors (see below), whose sum is σ = 16851072. Its totient is φ = 15446772.

The previous prime is 16148887. The next prime is 16148933. The reversal of 16148921 is 12984161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12984161 = 379 ⋅34259.

It is a cyclic number.

It is not a de Polignac number, because 16148921 - 2⁶ = 16148857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16148971) 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, 351041 + ... + 351086.

It is an arithmetic number, because the mean of its divisors is an integer number (4212768).

Almost surely, 2^16148921 is an apocalyptic number.

It is an amenable number.

16148921 is a deficient number, since it is larger than the sum of its proper divisors (702151).

16148921 is an equidigital number, since it uses as much as digits as its factorization.

16148921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702150.

The product of its digits is 3456, while the sum is 32.

The square root of 16148921 is about 4018.5720100553. The cubic root of 16148921 is about 252.7635831966.

The spelling of 16148921 in words is "sixteen million, one hundred forty-eight thousand, nine hundred twenty-one".