21408676200 has 144 divisors (see below), whose sum is σ = 71942270400. Its totient is φ = 5705424000.

The previous prime is 21408676123. The next prime is 21408676217. The reversal of 21408676200 is 267680412.

21408676200 is a `hidden beast` number, since 21 + 4 + 0 + 8 + 6 + 7 + 620 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4229271 + ... + 4234329.

It is an arithmetic number, because the mean of its divisors is an integer number (499599100).

Almost surely, 2^21408676200 is an apocalyptic number.

21408676200 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 21408676200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35971135200).

21408676200 is an abundant number, since it is smaller than the sum of its proper divisors (50533594200).

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

21408676200 is a wasteful number, since it uses less digits than its factorization.

21408676200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7432 (or 7420 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 21408676200 in words is "twenty-one billion, four hundred eight million, six hundred seventy-six thousand, two hundred".