21199868 has 12 divisors (see below), whose sum is σ = 37287600. Its totient is φ = 10546272.

The previous prime is 21199847. The next prime is 21199873. The reversal of 21199868 is 86899112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12521 + ... + 14112.

It is an arithmetic number, because the mean of its divisors is an integer number (3107300).

Almost surely, 2^21199868 is an apocalyptic number.

It is an amenable number.

21199868 is a deficient number, since it is larger than the sum of its proper divisors (16087732).

21199868 is a wasteful number, since it uses less digits than its factorization.

21199868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26836 (or 26834 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 21199868 is about 4604.3314389822. The cubic root of 21199868 is about 276.7649263087.

The spelling of 21199868 in words is "twenty-one million, one hundred ninety-nine thousand, eight hundred sixty-eight".