21023200320 has 56 divisors (see below), whose sum is σ = 66748664064. Its totient is φ = 5606186496.

The previous prime is 21023200291. The next prime is 21023200441. The reversal of 21023200320 is 2300232012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21023200320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10948624 + ... + 10950543.

Almost surely, 2^21023200320 is an apocalyptic number.

21023200320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023200320 is an abundant number, since it is smaller than the sum of its proper divisors (45725463744).

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

21023200320 is a wasteful number, since it uses less digits than its factorization.

21023200320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21899187 (or 21899177 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21023200320 its reverse (2300232012), we get a palindrome (23323432332).

The spelling of 21023200320 in words is "twenty-one billion, twenty-three million, two hundred thousand, three hundred twenty".