1111011101221 has 16 divisors (see below), whose sum is σ = 1282918733824. Its totient is φ = 942402968064.

The previous prime is 1111011101143. The next prime is 1111011101311. The reversal of 1111011101221 is 1221011101111.

It is a cyclic number.

It is not a de Polignac number, because 1111011101221 - 2⁹ = 1111011100709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111011101021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9545251 + ... + 9660943.

It is an arithmetic number, because the mean of its divisors is an integer number (80182420864).

Almost surely, 2^{1111011101221} is an apocalyptic number.

It is an amenable number.

1111011101221 is a deficient number, since it is larger than the sum of its proper divisors (171907632603).

1111011101221 is a wasteful number, since it uses less digits than its factorization.

1111011101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129940.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1111011101221 its reverse (1221011101111), we get a palindrome (2332022202332).

The spelling of 1111011101221 in words is "one trillion, one hundred eleven billion, eleven million, one hundred one thousand, two hundred twenty-one".