21706927 has 8 divisors (see below), whose sum is σ = 23726592. Its totient is φ = 19695000.

The previous prime is 21706921. The next prime is 21706931. The reversal of 21706927 is 72960712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21706927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21706892 and 21706901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706921) 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, 5052 + ... + 8302.

It is an arithmetic number, because the mean of its divisors is an integer number (2965824).

Almost surely, 2^21706927 is an apocalyptic number.

21706927 is a deficient number, since it is larger than the sum of its proper divisors (2019665).

21706927 is a wasteful number, since it uses less digits than its factorization.

21706927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3869.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21706927 is about 4659.0693276662. The cubic root of 21706927 is about 278.9541211715.

The spelling of 21706927 in words is "twenty-one million, seven hundred six thousand, nine hundred twenty-seven".