21954718 has 8 divisors (see below), whose sum is σ = 34869312. Its totient is φ = 10331616.

The previous prime is 21954707. The next prime is 21954731. The reversal of 21954718 is 81745912.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322830 + ... + 322897.

It is an arithmetic number, because the mean of its divisors is an integer number (4358664).

Almost surely, 2^21954718 is an apocalyptic number.

21954718 is a deficient number, since it is larger than the sum of its proper divisors (12914594).

21954718 is a wasteful number, since it uses less digits than its factorization.

21954718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645746.

The product of its digits is 20160, while the sum is 37.

The square root of 21954718 is about 4685.5861959844. The cubic root of 21954718 is about 280.0115556455.

The spelling of 21954718 in words is "twenty-one million, nine hundred fifty-four thousand, seven hundred eighteen".