21748342 has 16 divisors (see below), whose sum is σ = 40672512. Its totient is φ = 8473320.

The previous prime is 21748333. The next prime is 21748351. The reversal of 21748342 is 24384712.

It is an interprime number because it is at equal distance from previous prime (21748333) and next prime (21748351).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70458 + ... + 70765.

It is an arithmetic number, because the mean of its divisors is an integer number (2542032).

Almost surely, 2^21748342 is an apocalyptic number.

21748342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21748342 is a deficient number, since it is larger than the sum of its proper divisors (18924170).

21748342 is a wasteful number, since it uses less digits than its factorization.

21748342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141243.

The product of its digits is 10752, while the sum is 31.

The square root of 21748342 is about 4663.5117668984. The cubic root of 21748342 is about 279.1314155039.

The spelling of 21748342 in words is "twenty-one million, seven hundred forty-eight thousand, three hundred forty-two".