21098800 has 30 divisors (see below), whose sum is σ = 50690828. Its totient is φ = 8439360.

The previous prime is 21098783. The next prime is 21098807. The reversal of 21098800 is 889012.

It is a super-2 number, since 2×21098800² = 890318722880000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21098807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25974 + ... + 26773.

Almost surely, 2^21098800 is an apocalyptic number.

21098800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21098800 is an abundant number, since it is smaller than the sum of its proper divisors (29592028).

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

21098800 is a wasteful number, since it uses less digits than its factorization.

21098800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52765 (or 52754 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 21098800 is about 4593.3430091819. The cubic root of 21098800 is about 276.3244102494.

The spelling of 21098800 in words is "twenty-one million, ninety-eight thousand, eight hundred".