21321142 has 8 divisors (see below), whose sum is σ = 32459256. Its totient is φ = 10501392.

The previous prime is 21321133. The next prime is 21321169. The reversal of 21321142 is 24112312.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79423 + ... + 79690.

It is an arithmetic number, because the mean of its divisors is an integer number (4057407).

Almost surely, 2^21321142 is an apocalyptic number.

21321142 is a deficient number, since it is larger than the sum of its proper divisors (11138114).

21321142 is a wasteful number, since it uses less digits than its factorization.

21321142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159182.

The product of its digits is 96, while the sum is 16.

The square root of 21321142 is about 4617.4822143675. The cubic root of 21321142 is about 277.2916684332.

Adding to 21321142 its reverse (24112312), we get a palindrome (45433454).

The spelling of 21321142 in words is "twenty-one million, three hundred twenty-one thousand, one hundred forty-two".