21326936 has 8 divisors (see below), whose sum is σ = 39988020. Its totient is φ = 10663464.

The previous prime is 21326917. The next prime is 21326939. The reversal of 21326936 is 63962312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326939) 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 as a sum of consecutive naturals, namely, 1332926 + ... + 1332941.

Almost surely, 2^21326936 is an apocalyptic number.

It is an amenable number.

21326936 is a deficient number, since it is larger than the sum of its proper divisors (18661084).

21326936 is a wasteful number, since it uses less digits than its factorization.

21326936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665873 (or 2665869 counting only the distinct ones).

The product of its digits is 11664, while the sum is 32.

The square root of 21326936 is about 4618.1095699431. The cubic root of 21326936 is about 277.3167840737.

The spelling of 21326936 in words is "twenty-one million, three hundred twenty-six thousand, nine hundred thirty-six".