1212120100100 has 108 divisors (see below), whose sum is σ = 3295102045284. Its totient is φ = 383616011520.

The previous prime is 1212120100057. The next prime is 1212120100123. The reversal of 1212120100100 is 10010212121.

It can be written as a sum of positive squares in 6 ways, for example, as 477845917696 + 734274182404 = 691264^2 + 856898^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9450587 + ... + 9577986.

It is an arithmetic number, because the mean of its divisors is an integer number (30510204123).

Almost surely, 2^{1212120100100} is an apocalyptic number.

1212120100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212120100100 is an abundant number, since it is smaller than the sum of its proper divisors (2082981945184).

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

1212120100100 is a wasteful number, since it uses less digits than its factorization.

1212120100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19028614 (or 19028600 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1212120100100 its reverse (10010212121), we get a palindrome (1222130312221).

The spelling of 1212120100100 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred thousand, one hundred".