21282100 has 36 divisors (see below), whose sum is σ = 52781344. Its totient is φ = 7296480.

The previous prime is 21282083. The next prime is 21282103. The reversal of 21282100 is 128212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21282103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14502 + ... + 15901.

Almost surely, 2^21282100 is an apocalyptic number.

21282100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21282100 is an abundant number, since it is smaller than the sum of its proper divisors (31499244).

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

21282100 is a wasteful number, since it uses less digits than its factorization.

21282100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30424 (or 30417 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 21282100 is about 4613.2526486201. The cubic root of 21282100 is about 277.1223117130.

The spelling of 21282100 in words is "twenty-one million, two hundred eighty-two thousand, one hundred".