1220221221111 has 24 divisors (see below), whose sum is σ = 1782831520080. Its totient is φ = 804121296000.

The previous prime is 1220221221091. The next prime is 1220221221119. The reversal of 1220221221111 is 1111221220221.

1220221221111 is a `hidden beast` number, since 1 + 220 + 221 + 2 + 211 + 11 = 666.

It is not a de Polignac number, because 1220221221111 - 2⁶ = 1220221221047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221221119) 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, 2758696 + ... + 3170306.

It is an arithmetic number, because the mean of its divisors is an integer number (74284646670).

Almost surely, 2^{1220221221111} is an apocalyptic number.

1220221221111 is a deficient number, since it is larger than the sum of its proper divisors (562610298969).

1220221221111 is a wasteful number, since it uses less digits than its factorization.

1220221221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415407 (or 415404 counting only the distinct ones).

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

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

The spelling of 1220221221111 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred eleven".