1111202111221 has 4 divisors (see below), whose sum is σ = 1119951734272. Its totient is φ = 1102452488172.

The previous prime is 1111202111213. The next prime is 1111202111281. The reversal of 1111202111221 is 1221112021111.

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 1111202111221 - 2³ = 1111202111213 is a prime.

It is a super-2 number, since 2×1111202111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111202111195 and 1111202111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111202111281) 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, 4374811335 + ... + 4374811588.

It is an arithmetic number, because the mean of its divisors is an integer number (279987933568).

Almost surely, 2^{1111202111221} is an apocalyptic number.

It is an amenable number.

1111202111221 is a deficient number, since it is larger than the sum of its proper divisors (8749623051).

1111202111221 is an equidigital number, since it uses as much as digits as its factorization.

1111202111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8749623050.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1111202111221 its reverse (1221112021111), we get a palindrome (2332314132332).

The spelling of 1111202111221 in words is "one trillion, one hundred eleven billion, two hundred two million, one hundred eleven thousand, two hundred twenty-one".