1111201221001 has 4 divisors (see below), whose sum is σ = 1111203427600. Its totient is φ = 1111199014404.

The previous prime is 1111201220981. The next prime is 1111201221047. The reversal of 1111201221001 is 1001221021111.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1111201221001 - 2³³ = 1102611286409 is a prime.

It is a super-2 number, since 2×1111201221001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111201221061) 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, 63130 + ... + 1492108.

It is an arithmetic number, because the mean of its divisors is an integer number (277800856900).

Almost surely, 2^{1111201221001} is an apocalyptic number.

It is an amenable number.

1111201221001 is a deficient number, since it is larger than the sum of its proper divisors (2206599).

1111201221001 is an equidigital number, since it uses as much as digits as its factorization.

1111201221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206598.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1111201221001 its reverse (1001221021111), we get a palindrome (2112422242112).

The spelling of 1111201221001 in words is "one trillion, one hundred eleven billion, two hundred one million, two hundred twenty-one thousand, one".