1212021200100 has 144 divisors (see below), whose sum is σ = 3513495121920. Its totient is φ = 322587648000.

The previous prime is 1212021200099. The next prime is 1212021200113. The reversal of 1212021200100 is 10021202121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

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, 614302714 + ... + 614304686.

It is an arithmetic number, because the mean of its divisors is an integer number (24399271680).

Almost surely, 2^{1212021200100} is an apocalyptic number.

1212021200100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212021200100 is an abundant number, since it is smaller than the sum of its proper divisors (2301473921820).

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

1212021200100 is a wasteful number, since it uses less digits than its factorization.

1212021200100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4870 (or 4863 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1212021200100 its reverse (10021202121), we get a palindrome (1222042402221).

The spelling of 1212021200100 in words is "one trillion, two hundred twelve billion, twenty-one million, two hundred thousand, one hundred".