1212220112100 has 36 divisors (see below), whose sum is σ = 3507356858544. Its totient is φ = 323258696480.

The previous prime is 1212220112087. The next prime is 1212220112101. The reversal of 1212220112100 is 12110222121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1212220112100.

It is not an unprimeable number, because it can be changed into a prime (1212220112101) 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, 2020366554 + ... + 2020367153.

It is an arithmetic number, because the mean of its divisors is an integer number (97426579404).

Almost surely, 2^{1212220112100} is an apocalyptic number.

1212220112100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212220112100 is an abundant number, since it is smaller than the sum of its proper divisors (2295136746444).

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

1212220112100 is a wasteful number, since it uses less digits than its factorization.

1212220112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040733724 (or 4040733717 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1212220112100 its reverse (12110222121), we get a palindrome (1224330334221).

The spelling of 1212220112100 in words is "one trillion, two hundred twelve billion, two hundred twenty million, one hundred twelve thousand, one hundred".