11211112212210 has 128 divisors (see below), whose sum is σ = 30033074142720. Its totient is φ = 2975962982400.

The previous prime is 11211112212203. The next prime is 11211112212241. The reversal of 11211112212210 is 1221221111211.

It is a happy number.

11211112212210 is a `hidden beast` number, since 1 + 1 + 211 + 11 + 221 + 221 + 0 = 666.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 158800579 + ... + 158871161.

It is an arithmetic number, because the mean of its divisors is an integer number (234633391740).

Almost surely, 2^{11211112212210} is an apocalyptic number.

11211112212210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11211112212210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15016537071360).

11211112212210 is an abundant number, since it is smaller than the sum of its proper divisors (18821961930510).

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

11211112212210 is a wasteful number, since it uses less digits than its factorization.

11211112212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73281 (or 73275 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11211112212210 its reverse (1221221111211), we get a palindrome (12432333323421).

The spelling of 11211112212210 in words is "eleven trillion, two hundred eleven billion, one hundred twelve million, two hundred twelve thousand, two hundred ten".