21199896 has 48 divisors (see below), whose sum is σ = 60442200. Its totient is φ = 6694272.

The previous prime is 21199891. The next prime is 21199897. The reversal of 21199896 is 69899112.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21199891) 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 11 ways as a sum of consecutive naturals, for example, 6381 + ... + 9116.

Almost surely, 2^21199896 is an apocalyptic number.

It is an amenable number.

21199896 is an abundant number, since it is smaller than the sum of its proper divisors (39242304).

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

21199896 is a wasteful number, since it uses less digits than its factorization.

21199896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15528 (or 15521 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 21199896 is about 4604.3344795964. The cubic root of 21199896 is about 276.7650481556.

The spelling of 21199896 in words is "twenty-one million, one hundred ninety-nine thousand, eight hundred ninety-six".