21223320210 has 24 divisors (see below), whose sum is σ = 55180632780. Its totient is φ = 5659552032.

The previous prime is 21223320143. The next prime is 21223320211. The reversal of 21223320210 is 1202332212.

21223320210 is a `hidden beast` number, since 2 + 122 + 332 + 0 + 210 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18749551041 + 2473769169 = 136929^2 + 49737^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21223320211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117907245 + ... + 117907424.

Almost surely, 2^21223320210 is an apocalyptic number.

21223320210 is an abundant number, since it is smaller than the sum of its proper divisors (33957312570).

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

21223320210 is a wasteful number, since it uses less digits than its factorization.

21223320210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235814682 (or 235814679 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21223320210 its reverse (1202332212), we get a palindrome (22425652422).

The spelling of 21223320210 in words is "twenty-one billion, two hundred twenty-three million, three hundred twenty thousand, two hundred ten".