21222355210 has 48 divisors (see below), whose sum is σ = 44456087520. Its totient is φ = 7273113120.

The previous prime is 21222355207. The next prime is 21222355333. The reversal of 21222355210 is 1255322212.

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 23 ways as a sum of consecutive naturals, for example, 1330261 + ... + 1346119.

It is an arithmetic number, because the mean of its divisors is an integer number (926168490).

Almost surely, 2^21222355210 is an apocalyptic number.

21222355210 is an abundant number, since it is smaller than the sum of its proper divisors (23233732310).

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

21222355210 is a wasteful number, since it uses less digits than its factorization.

21222355210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18611 (or 18604 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21222355210 its reverse (1255322212), we get a palindrome (22477677422).

The spelling of 21222355210 in words is "twenty-one billion, two hundred twenty-two million, three hundred fifty-five thousand, two hundred ten".