1121220021221 has 8 divisors (see below), whose sum is σ = 1123909987200. Its totient is φ = 1118530674000.

The previous prime is 1121220021191. The next prime is 1121220021223. The reversal of 1121220021221 is 1221200221211.

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 1121220021221 - 2³⁰ = 1120146279397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121220021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121220021223) 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, 3581720 + ... + 3882158.

It is an arithmetic number, because the mean of its divisors is an integer number (140488748400).

Almost surely, 2^{1121220021221} is an apocalyptic number.

It is an amenable number.

1121220021221 is a deficient number, since it is larger than the sum of its proper divisors (2689965979).

1121220021221 is an equidigital number, since it uses as much as digits as its factorization.

1121220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309379.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1121220021221 its reverse (1221200221211), we get a palindrome (2342420242432).

The spelling of 1121220021221 in words is "one trillion, one hundred twenty-one billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".