21707926 has 4 divisors (see below), whose sum is σ = 32561892. Its totient is φ = 10853962.

The previous prime is 21707909. The next prime is 21707927. The reversal of 21707926 is 62970712.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21707891 and 21707900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5426980 + ... + 5426983.

It is an arithmetic number, because the mean of its divisors is an integer number (8140473).

Almost surely, 2^21707926 is an apocalyptic number.

21707926 is a deficient number, since it is larger than the sum of its proper divisors (10853966).

21707926 is a wasteful number, since it uses less digits than its factorization.

21707926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10853965.

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

The square root of 21707926 is about 4659.1765366854. The cubic root of 21707926 is about 278.9584004643.

The spelling of 21707926 in words is "twenty-one million, seven hundred seven thousand, nine hundred twenty-six".