21202221110 has 48 divisors (see below), whose sum is σ = 44802259920. Its totient is φ = 7202623680.

The previous prime is 21202221097. The next prime is 21202221113. The reversal of 21202221110 is 1112220212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202221113) 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 23 ways as a sum of consecutive naturals, for example, 145076 + ... + 251895.

It is an arithmetic number, because the mean of its divisors is an integer number (933380415).

Almost surely, 2^21202221110 is an apocalyptic number.

21202221110 is an abundant number, since it is smaller than the sum of its proper divisors (23600038810).

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

21202221110 is a wasteful number, since it uses less digits than its factorization.

21202221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397101 (or 397094 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21202221110 its reverse (1112220212), we get a palindrome (22314441322).

The spelling of 21202221110 in words is "twenty-one billion, two hundred two million, two hundred twenty-one thousand, one hundred ten".