21870300 has 36 divisors (see below), whose sum is σ = 63278936. Its totient is φ = 5832000.

The previous prime is 21870271. The next prime is 21870307. The reversal of 21870300 is 307812.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21870307) 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, 36151 + ... + 36750.

Almost surely, 2^21870300 is an apocalyptic number.

21870300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21870300 is an abundant number, since it is smaller than the sum of its proper divisors (41408636).

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

21870300 is a wasteful number, since it uses less digits than its factorization.

21870300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72918 (or 72911 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21870300 is about 4676.5692553409. The cubic root of 21870300 is about 279.6522042265.

The spelling of 21870300 in words is "twenty-one million, eight hundred seventy thousand, three hundred".