21942158 has 8 divisors (see below), whose sum is σ = 37615152. Its totient is φ = 9403776.

The previous prime is 21942143. The next prime is 21942191. The reversal of 21942158 is 85124912.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783635 + ... + 783662.

It is an arithmetic number, because the mean of its divisors is an integer number (4701894).

Almost surely, 2^21942158 is an apocalyptic number.

21942158 is a deficient number, since it is larger than the sum of its proper divisors (15672994).

21942158 is a wasteful number, since it uses less digits than its factorization.

21942158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567306.

The product of its digits is 5760, while the sum is 32.

The square root of 21942158 is about 4684.2457236998. The cubic root of 21942158 is about 279.9581485067.

The spelling of 21942158 in words is "twenty-one million, nine hundred forty-two thousand, one hundred fifty-eight".