111211220001 has 16 divisors (see below), whose sum is σ = 169540072448. Its totient is φ = 63521010000.

The previous prime is 111211219969. The next prime is 111211220093. The reversal of 111211220001 is 100022112111.

It is not a de Polignac number, because 111211220001 - 2⁵ = 111211219969 is a prime.

It is a super-2 number, since 2×111211220001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111211220201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1129045 + ... + 1223586.

It is an arithmetic number, because the mean of its divisors is an integer number (10596254528).

Almost surely, 2^111211220001 is an apocalyptic number.

It is an amenable number.

111211220001 is a deficient number, since it is larger than the sum of its proper divisors (58328852447).

111211220001 is a wasteful number, since it uses less digits than its factorization.

111211220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354892.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111211220001 its reverse (100022112111), we get a palindrome (211233332112).

The spelling of 111211220001 in words is "one hundred eleven billion, two hundred eleven million, two hundred twenty thousand, one".