21230213320 has 32 divisors (see below), whose sum is σ = 48422342520. Its totient is φ = 8375754240.

The previous prime is 21230213281. The next prime is 21230213341. The reversal of 21230213320 is 2331203212.

It can be written as a sum of positive squares in 4 ways, for example, as 10837226404 + 10392986916 = 104102^2 + 101946^2 .

It is a super-2 number, since 2×21230213320² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3632391 + ... + 3638230.

Almost surely, 2^21230213320 is an apocalyptic number.

21230213320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230213320 is an abundant number, since it is smaller than the sum of its proper divisors (27192129200).

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

21230213320 is a wasteful number, since it uses less digits than its factorization.

21230213320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7270705 (or 7270701 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21230213320 its reverse (2331203212), we get a palindrome (23561416532).

The spelling of 21230213320 in words is "twenty-one billion, two hundred thirty million, two hundred thirteen thousand, three hundred twenty".