21203202320 has 20 divisors (see below), whose sum is σ = 49297445580. Its totient is φ = 8481280896.

The previous prime is 21203202311. The next prime is 21203202373. The reversal of 21203202320 is 2320230212.

It can be written as a sum of positive squares in 2 ways, for example, as 10736275456 + 10466926864 = 103616^2 + 102308^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132519935 + ... + 132520094.

It is an arithmetic number, because the mean of its divisors is an integer number (2464872279).

Almost surely, 2^21203202320 is an apocalyptic number.

21203202320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203202320 is an abundant number, since it is smaller than the sum of its proper divisors (28094243260).

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

21203202320 is a wasteful number, since it uses less digits than its factorization.

21203202320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265040042 (or 265040036 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21203202320 its reverse (2320230212), we get a palindrome (23523432532).

The spelling of 21203202320 in words is "twenty-one billion, two hundred three million, two hundred two thousand, three hundred twenty".