1121210221121 has 4 divisors (see below), whose sum is σ = 1121213026752. Its totient is φ = 1121207415492.

The previous prime is 1121210221067. The next prime is 1121210221127. The reversal of 1121210221121 is 1211220121211.

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 a de Polignac number, because none of the positive numbers 2^k-1121210221121 is a prime.

It is a super-2 number, since 2×1121210221121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121210221121.

It is not an unprimeable number, because it can be changed into a prime (1121210221127) 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, 678821 + ... + 1644146.

It is an arithmetic number, because the mean of its divisors is an integer number (280303256688).

Almost surely, 2^{1121210221121} is an apocalyptic number.

It is an amenable number.

1121210221121 is a deficient number, since it is larger than the sum of its proper divisors (2805631).

1121210221121 is an equidigital number, since it uses as much as digits as its factorization.

1121210221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805630.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1121210221121 its reverse (1211220121211), we get a palindrome (2332430342332).

The spelling of 1121210221121 in words is "one trillion, one hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".