21590936 has 8 divisors (see below), whose sum is σ = 40483020. Its totient is φ = 10795464.

The previous prime is 21590923. The next prime is 21590941. The reversal of 21590936 is 63909512.

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

It is a junction number, because it is equal to n+sod(n) for n = 21590896 and 21590905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1349426 + ... + 1349441.

Almost surely, 2^21590936 is an apocalyptic number.

It is an amenable number.

21590936 is a deficient number, since it is larger than the sum of its proper divisors (18892084).

21590936 is a wasteful number, since it uses less digits than its factorization.

21590936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698873 (or 2698869 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21590936 is about 4646.6047819887. The cubic root of 21590936 is about 278.4563696025.

The spelling of 21590936 in words is "twenty-one million, five hundred ninety thousand, nine hundred thirty-six".