21230220320 has 48 divisors (see below), whose sum is σ = 50905024128. Its totient is φ = 8365336320.

The previous prime is 21230220317. The next prime is 21230220371. The reversal of 21230220320 is 2302203212.

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, 979496 + ... + 1000935.

It is an arithmetic number, because the mean of its divisors is an integer number (1060521336).

Almost surely, 2^21230220320 is an apocalyptic number.

21230220320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230220320 is an abundant number, since it is smaller than the sum of its proper divisors (29674803808).

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

21230220320 is a wasteful number, since it uses less digits than its factorization.

21230220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980513 (or 1980505 counting only the distinct ones).

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

Adding to 21230220320 its reverse (2302203212), we get a palindrome (23532423532).

The spelling of 21230220320 in words is "twenty-one billion, two hundred thirty million, two hundred twenty thousand, three hundred twenty".