21169342 has 16 divisors (see below), whose sum is σ = 32890752. Its totient is φ = 10208160.

The previous prime is 21169331. The next prime is 21169367. The reversal of 21169342 is 24396112.

It is a self number, because there is not a number n which added to its sum of digits gives 21169342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34228 + ... + 34840.

It is an arithmetic number, because the mean of its divisors is an integer number (2055672).

Almost surely, 2^21169342 is an apocalyptic number.

21169342 is a deficient number, since it is larger than the sum of its proper divisors (11721410).

21169342 is a wasteful number, since it uses less digits than its factorization.

21169342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203.

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

The square root of 21169342 is about 4601.0153227304. The cubic root of 21169342 is about 276.6320232102.

The spelling of 21169342 in words is "twenty-one million, one hundred sixty-nine thousand, three hundred forty-two".