21000302 has 8 divisors (see below), whose sum is σ = 31520016. Its totient is φ = 10493632.

The previous prime is 21000293. The next prime is 21000307. The reversal of 21000302 is 20300012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21000302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3998 + ... + 7614.

It is an arithmetic number, because the mean of its divisors is an integer number (3940002).

Almost surely, 2^21000302 is an apocalyptic number.

21000302 is a deficient number, since it is larger than the sum of its proper divisors (10519714).

21000302 is a wasteful number, since it uses less digits than its factorization.

21000302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6522.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 21000302 is about 4582.6086457388. The cubic root of 21000302 is about 275.8937401637.

Adding to 21000302 its reverse (20300012), we get a palindrome (41300314).

The spelling of 21000302 in words is "twenty-one million, three hundred two", and thus it is an aban number.