16242821 has 8 divisors (see below), whose sum is σ = 18705984. Its totient is φ = 13815360.

The previous prime is 16242817. The next prime is 16242829. The reversal of 16242821 is 12824261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16242821 - 2² = 16242817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16242829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7940 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (2338248).

Almost surely, 2^16242821 is an apocalyptic number.

It is an amenable number.

16242821 is a deficient number, since it is larger than the sum of its proper divisors (2463163).

16242821 is a wasteful number, since it uses less digits than its factorization.

16242821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17851.

The product of its digits is 1536, while the sum is 26.

The square root of 16242821 is about 4030.2383304217. The cubic root of 16242821 is about 253.2525456077.

The spelling of 16242821 in words is "sixteen million, two hundred forty-two thousand, eight hundred twenty-one".