21306499800 has 96 divisors (see below), whose sum is σ = 66077742480. Its totient is φ = 5679360000.

The previous prime is 21306499793. The next prime is 21306499817. The reversal of 21306499800 is 899460312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1794684 + ... + 1806516.

Almost surely, 2^21306499800 is an apocalyptic number.

21306499800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21306499800 is an abundant number, since it is smaller than the sum of its proper divisors (44771242680).

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

21306499800 is a wasteful number, since it uses less digits than its factorization.

21306499800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14853 (or 14844 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 21306499800 in words is "twenty-one billion, three hundred six million, four hundred ninety-nine thousand, eight hundred".