21320320302 has 24 divisors (see below), whose sum is σ = 46504060200. Its totient is φ = 7059076080.

The previous prime is 21320320283. The next prime is 21320320309. The reversal of 21320320302 is 20302302312.

It is a happy number.

21320320302 is a `hidden beast` number, since 21 + 3 + 20 + 320 + 302 = 666.

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 (21320320309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3972024 + ... + 3977387.

It is an arithmetic number, because the mean of its divisors is an integer number (1937669175).

Almost surely, 2^21320320302 is an apocalyptic number.

21320320302 is an abundant number, since it is smaller than the sum of its proper divisors (25183739898).

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

21320320302 is a wasteful number, since it uses less digits than its factorization.

21320320302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949568 (or 7949565 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21320320302 its reverse (20302302312), we get a palindrome (41622622614).

The spelling of 21320320302 in words is "twenty-one billion, three hundred twenty million, three hundred twenty thousand, three hundred two".