1111001111221 has 8 divisors (see below), whose sum is σ = 1119460621824. Its totient is φ = 1102572875040.

The previous prime is 1111001111173. The next prime is 1111001111237. The reversal of 1111001111221 is 1221111001111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1111001111221 - 2³⁷ = 973562157749 is a prime.

It is a super-2 number, since 2×1111001111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111001111261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7747285 + ... + 7889386.

It is an arithmetic number, because the mean of its divisors is an integer number (139932577728).

Almost surely, 2^{1111001111221} is an apocalyptic number.

It is an amenable number.

1111001111221 is a deficient number, since it is larger than the sum of its proper divisors (8459510603).

1111001111221 is a wasteful number, since it uses less digits than its factorization.

1111001111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15637211.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1111001111221 its reverse (1221111001111), we get a palindrome (2332112112332).

The spelling of 1111001111221 in words is "one trillion, one hundred eleven billion, one million, one hundred eleven thousand, two hundred twenty-one".