111021220001 has 4 divisors (see below), whose sum is σ = 111022103232. Its totient is φ = 111020336772.

The previous prime is 111021219989. The next prime is 111021220039. The reversal of 111021220001 is 100022120111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 111021220001 - 2⁶ = 111021219937 is a prime.

It is a super-2 number, since 2×111021220001² (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 (111021220801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213941 + ... + 517506.

It is an arithmetic number, because the mean of its divisors is an integer number (27755525808).

Almost surely, 2^111021220001 is an apocalyptic number.

It is an amenable number.

111021220001 is a deficient number, since it is larger than the sum of its proper divisors (883231).

111021220001 is an equidigital number, since it uses as much as digits as its factorization.

111021220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883230.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111021220001 its reverse (100022120111), we get a palindrome (211043340112).

The spelling of 111021220001 in words is "one hundred eleven billion, twenty-one million, two hundred twenty thousand, one".