21003223220 has 48 divisors (see below), whose sum is σ = 50520153600. Its totient is φ = 7185045504.

The previous prime is 21003223211. The next prime is 21003223229. The reversal of 21003223220 is 2232230012.

It is an interprime number because it is at equal distance from previous prime (21003223211) and next prime (21003223229).

It is a super-2 number, since 2×21003223220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003223229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 104204 + ... + 229923.

It is an arithmetic number, because the mean of its divisors is an integer number (1052503200).

Almost surely, 2^21003223220 is an apocalyptic number.

21003223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003223220 is an abundant number, since it is smaller than the sum of its proper divisors (29516930380).

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

21003223220 is a wasteful number, since it uses less digits than its factorization.

21003223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334592 (or 334590 counting only the distinct ones).

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

Adding to 21003223220 its reverse (2232230012), we get a palindrome (23235453232).

The spelling of 21003223220 in words is "twenty-one billion, three million, two hundred twenty-three thousand, two hundred twenty".