21868342 has 16 divisors (see below), whose sum is σ = 33546240. Its totient is φ = 10689192.

The previous prime is 21868337. The next prime is 21868367. The reversal of 21868342 is 24386812.

It is a junction number, because it is equal to n+sod(n) for n = 21868298 and 21868307.

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, 16459 + ... + 17737.

It is an arithmetic number, because the mean of its divisors is an integer number (2096640).

Almost surely, 2^21868342 is an apocalyptic number.

21868342 is a deficient number, since it is larger than the sum of its proper divisors (11677898).

21868342 is a wasteful number, since it uses less digits than its factorization.

21868342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467.

The product of its digits is 18432, while the sum is 34.

The square root of 21868342 is about 4676.3599091601. The cubic root of 21868342 is about 279.6438584279.

The spelling of 21868342 in words is "twenty-one million, eight hundred sixty-eight thousand, three hundred forty-two".