21364512 has 192 divisors, whose sum is σ = 68584320. Its totient is φ = 5750784.

The previous prime is 21364501. The next prime is 21364513. The reversal of 21364512 is 21546312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21364513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 403078 + ... + 403130.

It is an arithmetic number, because the mean of its divisors is an integer number (357210).

Almost surely, 2^21364512 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 21364512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34292160).

21364512 is an abundant number, since it is smaller than the sum of its proper divisors (47219808).

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

21364512 is a wasteful number, since it uses less digits than its factorization.

21364512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 107 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 21364512 is about 4622.1761108811. The cubic root of 21364512 is about 277.4795569714.

The spelling of 21364512 in words is "twenty-one million, three hundred sixty-four thousand, five hundred twelve".