111212122210 has 64 divisors (see below), whose sum is σ = 241019412480. Its totient is φ = 36093159360.

The previous prime is 111212122199. The next prime is 111212122247. The reversal of 111212122210 is 12221212111.

It is a super-2 number, since 2×111212122210² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1603267 + ... + 1671193.

It is an arithmetic number, because the mean of its divisors is an integer number (3765928320).

Almost surely, 2^111212122210 is an apocalyptic number.

111212122210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111212122210 is an abundant number, since it is smaller than the sum of its proper divisors (129807290270).

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

111212122210 is a wasteful number, since it uses less digits than its factorization.

111212122210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69191.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111212122210 its reverse (12221212111), we get a palindrome (123433334321).

The spelling of 111212122210 in words is "one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, two hundred ten".