11221220211210 has 96 divisors (see below), whose sum is σ = 31197214640592. Its totient is φ = 2788421990400.

The previous prime is 11221220211197. The next prime is 11221220211211. The reversal of 11221220211210 is 1211202212211.

11221220211210 is a `hidden beast` number, since 1 + 1 + 2 + 21 + 220 + 211 + 210 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 9407918276289 + 1813301934921 = 3067233^2 + 1346589^2 .

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

It is not an unprimeable number, because it can be changed into a prime (11221220211211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36153049 + ... + 36462108.

Almost surely, 2^{11221220211210} is an apocalyptic number.

11221220211210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11221220211210 is an abundant number, since it is smaller than the sum of its proper divisors (19975994429382).

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

11221220211210 is a wasteful number, since it uses less digits than its factorization.

11221220211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72615288 (or 72615285 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11221220211210 its reverse (1211202212211), we get a palindrome (12432422423421).

The spelling of 11221220211210 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, two hundred ten".