21300912 has 60 divisors (see below), whose sum is σ = 60759504. Its totient is φ = 6963840.

The previous prime is 21300907. The next prime is 21300941. The reversal of 21300912 is 21900312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6237 + ... + 9027.

Almost surely, 2^21300912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21300912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30379752).

21300912 is an abundant number, since it is smaller than the sum of its proper divisors (39458592).

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

21300912 is a wasteful number, since it uses less digits than its factorization.

21300912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858 (or 2849 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21300912 is about 4615.2911067451. The cubic root of 21300912 is about 277.2039403999.

The spelling of 21300912 in words is "twenty-one million, three hundred thousand, nine hundred twelve".