21210003320 has 32 divisors (see below), whose sum is σ = 52060918320. Its totient is φ = 7712728320.

The previous prime is 21210003319. The next prime is 21210003329. The reversal of 21210003320 is 2330001212.

It is a happy number.

It is a super-2 number, since 2×21210003320² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21210003295 and 21210003304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210003329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24101837 + ... + 24102716.

Almost surely, 2^21210003320 is an apocalyptic number.

21210003320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210003320 is an abundant number, since it is smaller than the sum of its proper divisors (30850915000).

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

21210003320 is a wasteful number, since it uses less digits than its factorization.

21210003320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48204575 (or 48204571 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21210003320 its reverse (2330001212), we get a palindrome (23540004532).

The spelling of 21210003320 in words is "twenty-one billion, two hundred ten million, three thousand, three hundred twenty".