21004302 has 16 divisors (see below), whose sum is σ = 45827712. Its totient is φ = 6364920.

The previous prime is 21004301. The next prime is 21004303. The reversal of 21004302 is 20340012.

It is an interprime number because it is at equal distance from previous prime (21004301) and next prime (21004303).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159058 + ... + 159189.

It is an arithmetic number, because the mean of its divisors is an integer number (2864232).

Almost surely, 2^21004302 is an apocalyptic number.

21004302 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21004302 is an abundant number, since it is smaller than the sum of its proper divisors (24823410).

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

21004302 is a wasteful number, since it uses less digits than its factorization.

21004302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318263.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21004302 is about 4583.0450576009. The cubic root of 21004302 is about 275.9112558626.

Adding to 21004302 its reverse (20340012), we get a palindrome (41344314).

The spelling of 21004302 in words is "twenty-one million, four thousand, three hundred two".