21670934 has 16 divisors (see below), whose sum is σ = 33037200. Its totient is φ = 10660224.

The previous prime is 21670933. The next prime is 21670967. The reversal of 21670934 is 43907612.

It is a self number, because there is not a number n which added to its sum of digits gives 21670934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21670933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37802 + ... + 38370.

It is an arithmetic number, because the mean of its divisors is an integer number (2064825).

Almost surely, 2^21670934 is an apocalyptic number.

21670934 is a deficient number, since it is larger than the sum of its proper divisors (11366266).

21670934 is a wasteful number, since it uses less digits than its factorization.

21670934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21670934 is about 4655.2050438192. The cubic root of 21670934 is about 278.7998547439.

The spelling of 21670934 in words is "twenty-one million, six hundred seventy thousand, nine hundred thirty-four".