1121111210221 has 16 divisors (see below), whose sum is σ = 1183912329600. Its totient is φ = 1060059101248.

The previous prime is 1121111210183. The next prime is 1121111210237. The reversal of 1121111210221 is 1220121111211.

It is not a de Polignac number, because 1121111210221 - 2¹⁵ = 1121111177453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121111210195 and 1121111210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121111210321) 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, 795706 + ... + 1695691.

It is an arithmetic number, because the mean of its divisors is an integer number (73994520600).

Almost surely, 2^{1121111210221} is an apocalyptic number.

It is an amenable number.

1121111210221 is a deficient number, since it is larger than the sum of its proper divisors (62801119379).

1121111210221 is a wasteful number, since it uses less digits than its factorization.

1121111210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491748.

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

Adding to 1121111210221 its reverse (1220121111211), we get a palindrome (2341232321432).

The spelling of 1121111210221 in words is "one trillion, one hundred twenty-one billion, one hundred eleven million, two hundred ten thousand, two hundred twenty-one".