21120122210 has 64 divisors (see below), whose sum is σ = 44530539264. Its totient is φ = 7126425600.

The previous prime is 21120122197. The next prime is 21120122213. The reversal of 21120122210 is 1222102112.

It is not an unprimeable number, because it can be changed into a prime (21120122213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53234 + ... + 212306.

It is an arithmetic number, because the mean of its divisors is an integer number (695789676).

Almost surely, 2^21120122210 is an apocalyptic number.

21120122210 is an abundant number, since it is smaller than the sum of its proper divisors (23410417054).

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

21120122210 is a wasteful number, since it uses less digits than its factorization.

21120122210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159179.

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

Adding to 21120122210 its reverse (1222102112), we get a palindrome (22342224322).

The spelling of 21120122210 in words is "twenty-one billion, one hundred twenty million, one hundred twenty-two thousand, two hundred ten".