1220112221101 has 4 divisors (see below), whose sum is σ = 1249871055804. Its totient is φ = 1190353386400.

The previous prime is 1220112221087. The next prime is 1220112221113. The reversal of 1220112221101 is 1011222110221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 583124667876 + 636987553225 = 763626^2 + 798115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220112221101 - 2²⁷ = 1219978003373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220112221161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14879417290 + ... + 14879417371.

It is an arithmetic number, because the mean of its divisors is an integer number (312467763951).

Almost surely, 2^{1220112221101} is an apocalyptic number.

It is an amenable number.

1220112221101 is a deficient number, since it is larger than the sum of its proper divisors (29758834703).

1220112221101 is an equidigital number, since it uses as much as digits as its factorization.

1220112221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29758834702.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1220112221101 its reverse (1011222110221), we get a palindrome (2231334331322).

The spelling of 1220112221101 in words is "one trillion, two hundred twenty billion, one hundred twelve million, two hundred twenty-one thousand, one hundred one".