11221211121210 has 96 divisors (see below), whose sum is σ = 29465689099392. Its totient is φ = 2962527350400.

The previous prime is 11221211121173. The next prime is 11221211121299. The reversal of 11221211121210 is 1212111212211.

It is a happy number.

11221211121210 is a `hidden beast` number, since 1 + 1 + 221 + 211 + 1 + 21 + 210 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 315832467 + ... + 315867993.

It is an arithmetic number, because the mean of its divisors is an integer number (306934261452).

Almost surely, 2^{11221211121210} is an apocalyptic number.

11221211121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11221211121210 is an abundant number, since it is smaller than the sum of its proper divisors (18244477978182).

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

11221211121210 is a wasteful number, since it uses less digits than its factorization.

11221211121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70388 (or 70385 counting only the distinct ones).

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

Adding to 11221211121210 its reverse (1212111212211), we get a palindrome (12433322333421).

The spelling of 11221211121210 in words is "eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred ten".