111212120221210 has 16 divisors (see below), whose sum is σ = 203574728541600. Its totient is φ = 43730867612176.

The previous prime is 111212120221183. The next prime is 111212120221211. The reversal of 111212120221210 is 12122021212111.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (111212120221211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94247558920 + ... + 94247560099.

It is an arithmetic number, because the mean of its divisors is an integer number (12723420533850).

Almost surely, 2^{111212120221210} is an apocalyptic number.

111212120221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111212120221210 is a deficient number, since it is larger than the sum of its proper divisors (92362608320390).

111212120221210 is a wasteful number, since it uses less digits than its factorization.

111212120221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188495119085.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111212120221210 its reverse (12122021212111), we get a palindrome (123334141433321).

Subtracting from 111212120221210 its reverse (12122021212111), we obtain a palindrome (99090099009099).

The spelling of 111212120221210 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty million, two hundred twenty-one thousand, two hundred ten".