21110203320 has 64 divisors (see below), whose sum is σ = 63374192640. Its totient is φ = 5625513600.

The previous prime is 21110203243. The next prime is 21110203337. The reversal of 21110203320 is 2330201112.

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 21110203320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116725 + ... + 236315.

It is an arithmetic number, because the mean of its divisors is an integer number (990221760).

Almost surely, 2^21110203320 is an apocalyptic number.

21110203320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110203320 is an abundant number, since it is smaller than the sum of its proper divisors (42263989320).

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

21110203320 is a wasteful number, since it uses less digits than its factorization.

21110203320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121076 (or 121072 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21110203320 its reverse (2330201112), we get a palindrome (23440404432).

The spelling of 21110203320 in words is "twenty-one billion, one hundred ten million, two hundred three thousand, three hundred twenty".