21282342 has 16 divisors (see below), whose sum is σ = 42802032. Its totient is φ = 7054560.

The previous prime is 21282341. The next prime is 21282343. The reversal of 21282342 is 24328212.

It is an interprime number because it is at equal distance from previous prime (21282341) and next prime (21282343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21282341) 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, 8713 + ... + 10884.

It is an arithmetic number, because the mean of its divisors is an integer number (2675127).

Almost surely, 2^21282342 is an apocalyptic number.

21282342 is an abundant number, since it is smaller than the sum of its proper divisors (21519690).

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

21282342 is a wasteful number, since it uses less digits than its factorization.

21282342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19783.

The product of its digits is 1536, while the sum is 24.

The square root of 21282342 is about 4613.2788773279. The cubic root of 21282342 is about 277.1233621003.

The spelling of 21282342 in words is "twenty-one million, two hundred eighty-two thousand, three hundred forty-two".