21947935 has 8 divisors (see below), whose sum is σ = 27886896. Its totient is φ = 16525440.

The previous prime is 21947923. The next prime is 21947951. The reversal of 21947935 is 53974912.

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

It is not a de Polignac number, because 21947935 - 2⁵ = 21947903 is a prime.

It is a Duffinian number.

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, 129021 + ... + 129190.

It is an arithmetic number, because the mean of its divisors is an integer number (3485862).

Almost surely, 2^21947935 is an apocalyptic number.

21947935 is a deficient number, since it is larger than the sum of its proper divisors (5938961).

21947935 is a wasteful number, since it uses less digits than its factorization.

21947935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258233.

The product of its digits is 68040, while the sum is 40.

The square root of 21947935 is about 4684.8623245513. The cubic root of 21947935 is about 279.9827157698.

The spelling of 21947935 in words is "twenty-one million, nine hundred forty-seven thousand, nine hundred thirty-five".