21320302 has 4 divisors (see below), whose sum is σ = 31980456. Its totient is φ = 10660150.

The previous prime is 21320297. The next prime is 21320311. The reversal of 21320302 is 20302312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330074 + ... + 5330077.

It is an arithmetic number, because the mean of its divisors is an integer number (7995114).

Almost surely, 2^21320302 is an apocalyptic number.

21320302 is a deficient number, since it is larger than the sum of its proper divisors (10660154).

21320302 is a wasteful number, since it uses less digits than its factorization.

21320302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10660153.

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

The square root of 21320302 is about 4617.3912548104. The cubic root of 21320302 is about 277.2880268512.

Adding to 21320302 its reverse (20302312), we get a palindrome (41622614).

The spelling of 21320302 in words is "twenty-one million, three hundred twenty thousand, three hundred two".