1220112112221 has 48 divisors (see below), whose sum is σ = 1908169136640. Its totient is φ = 748633311360.

The previous prime is 1220112112213. The next prime is 1220112112229. The reversal of 1220112112221 is 1222112110221.

1220112112221 is a `hidden beast` number, since 1 + 220 + 11 + 211 + 2 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (1220112112213) and next prime (1220112112229).

It is not a de Polignac number, because 1220112112221 - 2³ = 1220112112213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220112112194 and 1220112112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220112112229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4036276 + ... + 4328018.

It is an arithmetic number, because the mean of its divisors is an integer number (39753523680).

Almost surely, 2^{1220112112221} is an apocalyptic number.

It is an amenable number.

1220112112221 is a deficient number, since it is larger than the sum of its proper divisors (688057024419).

1220112112221 is a wasteful number, since it uses less digits than its factorization.

1220112112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292466 (or 292463 counting only the distinct ones).

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

Adding to 1220112112221 its reverse (1222112110221), we get a palindrome (2442224222442).

The spelling of 1220112112221 in words is "one trillion, two hundred twenty billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty-one".