21518260200 has 192 divisors, whose sum is σ = 76122360000. Its totient is φ = 5583064320.

The previous prime is 21518260193. The next prime is 21518260207. The reversal of 21518260200 is 206281512.

It is a happy number.

21518260200 is a `hidden beast` number, since 2 + 1 + 51 + 8 + 2 + 602 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21518260193) and next prime (21518260207).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21518260207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 145951 + ... + 253649.

It is an arithmetic number, because the mean of its divisors is an integer number (396470625).

Almost surely, 2^21518260200 is an apocalyptic number.

21518260200 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 21518260200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38061180000).

21518260200 is an abundant number, since it is smaller than the sum of its proper divisors (54604099800).

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

21518260200 is a wasteful number, since it uses less digits than its factorization.

21518260200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107761 (or 107746 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 21518260200 in words is "twenty-one billion, five hundred eighteen million, two hundred sixty thousand, two hundred".