1111221220221 has 48 divisors (see below), whose sum is σ = 1837408734720. Its totient is φ = 633941938080.

The previous prime is 1111221220217. The next prime is 1111221220273. The reversal of 1111221220221 is 1220221221111.

1111221220221 is a `hidden beast` number, since 1 + 1 + 1 + 1 + 221 + 220 + 221 = 666.

It is not a de Polignac number, because 1111221220221 - 2² = 1111221220217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1111221220194 and 1111221220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111221220121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108311590 + ... + 108321848.

It is an arithmetic number, because the mean of its divisors is an integer number (38279348640).

Almost surely, 2^{1111221220221} is an apocalyptic number.

It is an amenable number.

1111221220221 is a deficient number, since it is larger than the sum of its proper divisors (726187514499).

1111221220221 is a wasteful number, since it uses less digits than its factorization.

1111221220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12926 (or 12923 counting only the distinct ones).

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

Adding to 1111221220221 its reverse (1220221221111), we get a palindrome (2331442441332).

The spelling of 1111221220221 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-one".