111212212220001 has 20 divisors (see below), whose sum is σ = 166141502664192. Its totient is φ = 74137155049368.

The previous prime is 111212212219961. The next prime is 111212212220003. The reversal of 111212212220001 is 100022212212111.

It is not a de Polignac number, because 111212212220001 - 2²⁵ = 111212178665569 is a prime.

It is a super-2 number, since 2×111212212220001² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111212212220003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38598705 + ... + 41379758.

Almost surely, 2^{111212212220001} is an apocalyptic number.

It is an amenable number.

111212212220001 is a deficient number, since it is larger than the sum of its proper divisors (54929290444191).

111212212220001 is an equidigital number, since it uses as much as digits as its factorization.

111212212220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79995642 (or 79995633 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111212212220001 its reverse (100022212212111), we get a palindrome (211234424432112).

The spelling of 111212212220001 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twelve million, two hundred twenty thousand, one".