21024901800 has 288 divisors, whose sum is σ = 80857920000. Its totient is φ = 4796029440.

The previous prime is 21024901787. The next prime is 21024901811. The reversal of 21024901800 is 810942012.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7646826 + ... + 7649574.

Almost surely, 2^21024901800 is an apocalyptic number.

21024901800 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 21024901800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40428960000).

21024901800 is an abundant number, since it is smaller than the sum of its proper divisors (59833018200).

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

21024901800 is a wasteful number, since it uses less digits than its factorization.

21024901800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385 (or 3373 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 21024901800 in words is "twenty-one billion, twenty-four million, nine hundred one thousand, eight hundred".