1220112121100 has 72 divisors (see below), whose sum is σ = 2657541239808. Its totient is φ = 486222004800.

The previous prime is 1220112121051. The next prime is 1220112121103. The reversal of 1220112121100 is 11212110221.

It is not an unprimeable number, because it can be changed into a prime (1220112121103) 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, 66638147 + ... + 66656453.

Almost surely, 2^{1220112121100} is an apocalyptic number.

1220112121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220112121100 is an abundant number, since it is smaller than the sum of its proper divisors (1437429118708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220112121100 is a wasteful number, since it uses less digits than its factorization.

1220112121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20775 (or 20768 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1220112121100 its reverse (11212110221), we get a palindrome (1231324231321).

It can be divided in two parts, 12201121 and 21100, that added together give a palindrome (12222221).

The spelling of 1220112121100 in words is "one trillion, two hundred twenty billion, one hundred twelve million, one hundred twenty-one thousand, one hundred".