21713935 has 8 divisors (see below), whose sum is σ = 26325936. Its totient is φ = 17191680.

The previous prime is 21713929. The next prime is 21713957. The reversal of 21713935 is 53931712.

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

It is not a de Polignac number, because 21713935 - 2³ = 21713927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21713897 and 21713906.

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, 21901 + ... + 22870.

It is an arithmetic number, because the mean of its divisors is an integer number (3290742).

Almost surely, 2^21713935 is an apocalyptic number.

21713935 is a deficient number, since it is larger than the sum of its proper divisors (4612001).

21713935 is an equidigital number, since it uses as much as digits as its factorization.

21713935 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44873.

The product of its digits is 5670, while the sum is 31.

The square root of 21713935 is about 4659.8213485068. The cubic root of 21713935 is about 278.9841377055.

The spelling of 21713935 in words is "twenty-one million, seven hundred thirteen thousand, nine hundred thirty-five".