1121220221221 has 8 divisors (see below), whose sum is σ = 1165380069600. Its totient is φ = 1077426845040.

The previous prime is 1121220221213. The next prime is 1121220221243. The reversal of 1121220221221 is 1221220221211.

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 1121220221221 - 2³ = 1121220221213 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 (1121220224221) 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, 91611811 + ... + 91624048.

It is an arithmetic number, because the mean of its divisors is an integer number (145672508700).

Almost surely, 2^{1121220221221} is an apocalyptic number.

It is an amenable number.

1121220221221 is a deficient number, since it is larger than the sum of its proper divisors (44159848379).

1121220221221 is a wasteful number, since it uses less digits than its factorization.

1121220221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183236099.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1121220221221 its reverse (1221220221211), we get a palindrome (2342440442432).

The spelling of 1121220221221 in words is "one trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".