21304030 has 32 divisors (see below), whose sum is σ = 42039648. Its totient is φ = 7708800.

The previous prime is 21304027. The next prime is 21304061. The reversal of 21304030 is 3040312.

It is a self number, because there is not a number n which added to its sum of digits gives 21304030.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31900 + ... + 32560.

It is an arithmetic number, because the mean of its divisors is an integer number (1313739).

Almost surely, 2^21304030 is an apocalyptic number.

21304030 is a deficient number, since it is larger than the sum of its proper divisors (20735618).

21304030 is a wasteful number, since it uses less digits than its factorization.

21304030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21304030 is about 4615.6288845617. The cubic root of 21304030 is about 277.2174653250.

Adding to 21304030 its reverse (3040312), we get a palindrome (24344342).

The spelling of 21304030 in words is "twenty-one million, three hundred four thousand, thirty".