21556696 has 16 divisors (see below), whose sum is σ = 46193040. Its totient is φ = 9238560.

The previous prime is 21556673. The next prime is 21556699. The reversal of 21556696 is 69665512.

It is a super-2 number, since 2×21556696² = 929382284872832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21556699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192415 + ... + 192526.

It is an arithmetic number, because the mean of its divisors is an integer number (2887065).

Almost surely, 2^21556696 is an apocalyptic number.

It is an amenable number.

21556696 is an abundant number, since it is smaller than the sum of its proper divisors (24636344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21556696 is a wasteful number, since it uses less digits than its factorization.

21556696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384954 (or 384950 counting only the distinct ones).

The product of its digits is 97200, while the sum is 40.

The square root of 21556696 is about 4642.9189094793. The cubic root of 21556696 is about 278.3090949845.

The spelling of 21556696 in words is "twenty-one million, five hundred fifty-six thousand, six hundred ninety-six".