21540246200 has 96 divisors (see below), whose sum is σ = 55027728000. Its totient is φ = 7776355200.

The previous prime is 21540246199. The next prime is 21540246227. The reversal of 21540246200 is 264204512.

It is a super-2 number, since 2×21540246200² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21540246200.

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, 270581 + ... + 341019.

It is an arithmetic number, because the mean of its divisors is an integer number (573205500).

Almost surely, 2^21540246200 is an apocalyptic number.

21540246200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21540246200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27513864000).

21540246200 is an abundant number, since it is smaller than the sum of its proper divisors (33487481800).

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

21540246200 is a wasteful number, since it uses less digits than its factorization.

21540246200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70605 (or 70596 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The spelling of 21540246200 in words is "twenty-one billion, five hundred forty million, two hundred forty-six thousand, two hundred".