21220122210 has 64 divisors (see below), whose sum is σ = 58223750400. Its totient is φ = 4848648192.

The previous prime is 21220122197. The next prime is 21220122221. The reversal of 21220122210 is 1222102212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21220122210.

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 31 ways as a sum of consecutive naturals, for example, 658146 + ... + 689634.

It is an arithmetic number, because the mean of its divisors is an integer number (909746100).

Almost surely, 2^21220122210 is an apocalyptic number.

21220122210 is an abundant number, since it is smaller than the sum of its proper divisors (37003628190).

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

21220122210 is a wasteful number, since it uses less digits than its factorization.

21220122210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34715.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220122210 its reverse (1222102212), we get a palindrome (22442224422).

The spelling of 21220122210 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, two hundred ten".