21304062 has 48 divisors (see below), whose sum is σ = 50083488. Its totient is φ = 6505920.

The previous prime is 21304061. The next prime is 21304069. The reversal of 21304062 is 26040312.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304061) 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 23 ways as a sum of consecutive naturals, for example, 42103 + ... + 42605.

It is an arithmetic number, because the mean of its divisors is an integer number (1043406).

Almost surely, 2^21304062 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21304062, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25041744).

21304062 is an abundant number, since it is smaller than the sum of its proper divisors (28779426).

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

21304062 is a wasteful number, since it uses less digits than its factorization.

21304062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 702 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21304062 is about 4615.6323510436. The cubic root of 21304062 is about 277.2176041243.

Adding to 21304062 its reverse (26040312), we get a palindrome (47344374).

The spelling of 21304062 in words is "twenty-one million, three hundred four thousand, sixty-two".