21300822 has 24 divisors (see below), whose sum is σ = 46393776. Its totient is φ = 7063056.

The previous prime is 21300791. The next prime is 21300833. The reversal of 21300822 is 22800312.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21300795 and 21300804.

It is a congruent number.

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, 543 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (1933074).

Almost surely, 2^21300822 is an apocalyptic number.

21300822 is an abundant number, since it is smaller than the sum of its proper divisors (25092954).

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

21300822 is a wasteful number, since it uses less digits than its factorization.

21300822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6212 (or 6209 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21300822 is about 4615.2813565372. The cubic root of 21300822 is about 277.2035499880.

It can be divided in two parts, 21300 and 822, that added together give a palindrome (22122).

The spelling of 21300822 in words is "twenty-one million, three hundred thousand, eight hundred twenty-two".