21954705 has 8 divisors (see below), whose sum is σ = 35127552. Its totient is φ = 11709168.

The previous prime is 21954679. The next prime is 21954707. The reversal of 21954705 is 50745912.

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

It is not a de Polignac number, because 21954705 - 2⁷ = 21954577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21954707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731809 + ... + 731838.

It is an arithmetic number, because the mean of its divisors is an integer number (4390944).

Almost surely, 2^21954705 is an apocalyptic number.

It is an amenable number.

21954705 is a deficient number, since it is larger than the sum of its proper divisors (13172847).

21954705 is a wasteful number, since it uses less digits than its factorization.

21954705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463655.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 21954705 is about 4685.5848087512. The cubic root of 21954705 is about 280.0115003780.

The spelling of 21954705 in words is "twenty-one million, nine hundred fifty-four thousand, seven hundred five".