1121021221221 has 24 divisors (see below), whose sum is σ = 1768396855680. Its totient is φ = 678660964800.

The previous prime is 1121021221181. The next prime is 1121021221267. The reversal of 1121021221221 is 1221221201211.

1121021221221 is a `hidden beast` number, since 1 + 1 + 210 + 212 + 21 + 221 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1121021221221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121021221194 and 1121021221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121021221321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6124656 + ... + 6305033.

It is an arithmetic number, because the mean of its divisors is an integer number (73683202320).

Almost surely, 2^{1121021221221} is an apocalyptic number.

1121021221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121021221221 is a deficient number, since it is larger than the sum of its proper divisors (647375634459).

1121021221221 is a wasteful number, since it uses less digits than its factorization.

1121021221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12430617 (or 12430614 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1121021221221 its reverse (1221221201211), we get a palindrome (2342242422432).

The spelling of 1121021221221 in words is "one trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".