21706334 has 8 divisors (see below), whose sum is σ = 35064120. Its totient is φ = 10018296.

The previous prime is 21706313. The next prime is 21706337. The reversal of 21706334 is 43360712.

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 834859 = 21706334 / (2 + 1 + 7 + 0 + 6 + 3 + 3 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706337) 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, 417404 + ... + 417455.

It is an arithmetic number, because the mean of its divisors is an integer number (4383015).

Almost surely, 2^21706334 is an apocalyptic number.

21706334 is a deficient number, since it is larger than the sum of its proper divisors (13357786).

21706334 is a wasteful number, since it uses less digits than its factorization.

21706334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834874.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21706334 is about 4659.0056879124. The cubic root of 21706334 is about 278.9515809485.

The spelling of 21706334 in words is "twenty-one million, seven hundred six thousand, three hundred thirty-four".