1220221212111 has 12 divisors (see below), whose sum is σ = 1922772819240. Its totient is φ = 739528007280.

The previous prime is 1220221212053. The next prime is 1220221212151. The reversal of 1220221212111 is 1112121220221.

1220221212111 is a `hidden beast` number, since 1 + 220 + 221 + 212 + 1 + 11 = 666.

It is not a de Polignac number, because 1220221212111 - 2¹⁵ = 1220221179343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221212151) 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, 6162733296 + ... + 6162733493.

It is an arithmetic number, because the mean of its divisors is an integer number (160231068270).

Almost surely, 2^{1220221212111} is an apocalyptic number.

1220221212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220221212111 is a deficient number, since it is larger than the sum of its proper divisors (702551607129).

1220221212111 is a wasteful number, since it uses less digits than its factorization.

1220221212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12325466806 (or 12325466803 counting only the distinct ones).

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

Adding to 1220221212111 its reverse (1112121220221), we get a palindrome (2332342432332).

The spelling of 1220221212111 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twelve thousand, one hundred eleven".