21596956 has 12 divisors (see below), whose sum is σ = 39014080. Its totient is φ = 10450080.

The previous prime is 21596951. The next prime is 21596959. The reversal of 21596956 is 65969512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21596951) 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 3 ways as a sum of consecutive naturals, for example, 86961 + ... + 87208.

Almost surely, 2^21596956 is an apocalyptic number.

It is an amenable number.

21596956 is a deficient number, since it is larger than the sum of its proper divisors (17417124).

21596956 is a wasteful number, since it uses less digits than its factorization.

21596956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174204 (or 174202 counting only the distinct ones).

The product of its digits is 145800, while the sum is 43.

The square root of 21596956 is about 4647.2525216519. The cubic root of 21596956 is about 278.4822469981.

The spelling of 21596956 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred fifty-six".