111021221121210 has 24 divisors (see below), whose sum is σ = 288655174915380. Its totient is φ = 29605658965632.

The previous prime is 111021221121203. The next prime is 111021221121211. The reversal of 111021221121210 is 12121122120111.

It is a happy number.

111021221121210 is a `hidden beast` number, since 1 + 1 + 10 + 212 + 211 + 21 + 210 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 108685816712001 + 2335404409209 = 10425249^2 + 1528203^2 .

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 (111021221121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 616784561695 + ... + 616784561874.

Almost surely, 2^{111021221121210} is an apocalyptic number.

111021221121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111021221121210 is an abundant number, since it is smaller than the sum of its proper divisors (177633953794170).

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

111021221121210 is a wasteful number, since it uses less digits than its factorization.

111021221121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233569123582 (or 1233569123579 counting only the distinct ones).

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

Adding to 111021221121210 its reverse (12121122120111), we get a palindrome (123142343241321).

The spelling of 111021221121210 in words is "one hundred eleven trillion, twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred ten".