16821342 has 48 divisors (see below), whose sum is σ = 37834368. Its totient is φ = 5397840.

The previous prime is 16821341. The next prime is 16821359. The reversal of 16821342 is 24312861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79617 + ... + 79827.

It is an arithmetic number, because the mean of its divisors is an integer number (788216).

Almost surely, 2^16821342 is an apocalyptic number.

16821342 is an abundant number, since it is smaller than the sum of its proper divisors (21013026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16821342 is a wasteful number, since it uses less digits than its factorization.

16821342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 362 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 16821342 is about 4101.3829374980. The cubic root of 16821342 is about 256.2242399645.

The spelling of 16821342 in words is "sixteen million, eight hundred twenty-one thousand, three hundred forty-two".