21942746 has 8 divisors (see below), whose sum is σ = 37616160. Its totient is φ = 9404028.

The previous prime is 21942731. The next prime is 21942751. The reversal of 21942746 is 64724912.

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

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, 783656 + ... + 783683.

It is an arithmetic number, because the mean of its divisors is an integer number (4702020).

Almost surely, 2^21942746 is an apocalyptic number.

21942746 is a deficient number, since it is larger than the sum of its proper divisors (15673414).

21942746 is a wasteful number, since it uses less digits than its factorization.

21942746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567348.

The product of its digits is 24192, while the sum is 35.

The square root of 21942746 is about 4684.3084868527. The cubic root of 21942746 is about 279.9606492319.

The spelling of 21942746 in words is "twenty-one million, nine hundred forty-two thousand, seven hundred forty-six".