1121212213221 has 4 divisors (see below), whose sum is σ = 1494949617632. Its totient is φ = 747474808812.

The previous prime is 1121212213201. The next prime is 1121212213229. The reversal of 1121212213221 is 1223122121211.

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 not a de Polignac number, because 1121212213221 - 2⁹ = 1121212212709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121212213229) 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, 186868702201 + ... + 186868702206.

It is an arithmetic number, because the mean of its divisors is an integer number (373737404408).

Almost surely, 2^{1121212213221} is an apocalyptic number.

It is an amenable number.

1121212213221 is a deficient number, since it is larger than the sum of its proper divisors (373737404411).

1121212213221 is an equidigital number, since it uses as much as digits as its factorization.

1121212213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373737404410.

The product of its digits is 192, while the sum is 21.

Adding to 1121212213221 its reverse (1223122121211), we get a palindrome (2344334334432).

The spelling of 1121212213221 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred thirteen thousand, two hundred twenty-one".