1111121220321 has 12 divisors (see below), whose sum is σ = 1834231855872. Its totient is φ = 634926411576.

The previous prime is 1111121220317. The next prime is 1111121220323. The reversal of 1111121220321 is 1230221211111.

It is a happy number.

1111121220321 is a `hidden beast` number, since 1 + 1 + 1 + 1 + 121 + 220 + 321 = 666.

It is not a de Polignac number, because 1111121220321 - 2² = 1111121220317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111121220294 and 1111121220303.

It is not an unprimeable number, because it can be changed into a prime (1111121220323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8818422321 + ... + 8818422446.

It is an arithmetic number, because the mean of its divisors is an integer number (152852654656).

Almost surely, 2^{1111121220321} is an apocalyptic number.

It is an amenable number.

1111121220321 is a deficient number, since it is larger than the sum of its proper divisors (723110635551).

1111121220321 is a wasteful number, since it uses less digits than its factorization.

1111121220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17636844780 (or 17636844777 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1111121220321 its reverse (1230221211111), we get a palindrome (2341342431432).

The spelling of 1111121220321 in words is "one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, three hundred twenty-one".