21113343220 has 24 divisors (see below), whose sum is σ = 44351997984. Its totient is φ = 8442674976.

The previous prime is 21113343217. The next prime is 21113343257. The reversal of 21113343220 is 2234331112.

It is a junction number, because it is equal to n+sod(n) for n = 21113343191 and 21113343200.

It is a congruent number.

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, 100734 + ... + 228853.

It is an arithmetic number, because the mean of its divisors is an integer number (1847999916).

Almost surely, 2^21113343220 is an apocalyptic number.

21113343220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113343220 is an abundant number, since it is smaller than the sum of its proper divisors (23238654764).

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

21113343220 is a wasteful number, since it uses less digits than its factorization.

21113343220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332799 (or 332797 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21113343220 its reverse (2234331112), we get a palindrome (23347674332).

The spelling of 21113343220 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-three thousand, two hundred twenty".