21607934 has 4 divisors (see below), whose sum is σ = 32411904. Its totient is φ = 10803966.

The previous prime is 21607933. The next prime is 21607979. The reversal of 21607934 is 43970612.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21607934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21607933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5401982 + ... + 5401985.

It is an arithmetic number, because the mean of its divisors is an integer number (8102976).

Almost surely, 2^21607934 is an apocalyptic number.

21607934 is a deficient number, since it is larger than the sum of its proper divisors (10803970).

21607934 is a wasteful number, since it uses less digits than its factorization.

21607934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10803969.

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

The square root of 21607934 is about 4648.4334995781. The cubic root of 21607934 is about 278.5294243295.

The spelling of 21607934 in words is "twenty-one million, six hundred seven thousand, nine hundred thirty-four".