21709334 has 8 divisors (see below), whose sum is σ = 32852520. Its totient is φ = 10758496.

The previous prime is 21709333. The next prime is 21709349. The reversal of 21709334 is 43390712.

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

It is a junction number, because it is equal to n+sod(n) for n = 21709297 and 21709306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21709333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47804 + ... + 48255.

It is an arithmetic number, because the mean of its divisors is an integer number (4106565).

Almost surely, 2^21709334 is an apocalyptic number.

21709334 is a deficient number, since it is larger than the sum of its proper divisors (11143186).

21709334 is a wasteful number, since it uses less digits than its factorization.

21709334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96174.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 21709334 is about 4659.3276338974. The cubic root of 21709334 is about 278.9644315170.

The spelling of 21709334 in words is "twenty-one million, seven hundred nine thousand, three hundred thirty-four".