111212221121210 has 64 divisors (see below), whose sum is σ = 227656819565568. Its totient is φ = 38748777600000.

The previous prime is 111212221121153. The next prime is 111212221121219. The reversal of 111212221121210 is 12121122212111.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (111212221121219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161108831 + ... + 161797650.

It is an arithmetic number, because the mean of its divisors is an integer number (3557137805712).

Almost surely, 2^{111212221121210} is an apocalyptic number.

111212221121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111212221121210 is an abundant number, since it is smaller than the sum of its proper divisors (116444598444358).

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

111212221121210 is a wasteful number, since it uses less digits than its factorization.

111212221121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322906631.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111212221121210 its reverse (12121122212111), we get a palindrome (123333343333321).

The spelling of 111212221121210 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred ten".