16421243 has 4 divisors (see below), whose sum is σ = 16546728. Its totient is φ = 16295760.

The previous prime is 16421239. The next prime is 16421267. The reversal of 16421243 is 34212461.

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

It is a cyclic number.

It is not a de Polignac number, because 16421243 - 2² = 16421239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16421203) 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, 62546 + ... + 62807.

It is an arithmetic number, because the mean of its divisors is an integer number (4136682).

Almost surely, 2^16421243 is an apocalyptic number.

16421243 is a deficient number, since it is larger than the sum of its proper divisors (125485).

16421243 is a wasteful number, since it uses less digits than its factorization.

16421243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125484.

The product of its digits is 1152, while the sum is 23.

The square root of 16421243 is about 4052.3132899617. The cubic root of 16421243 is about 254.1764692209.

The spelling of 16421243 in words is "sixteen million, four hundred twenty-one thousand, two hundred forty-three".