1212020020100 has 54 divisors (see below), whose sum is σ = 2793894935790. Its totient is φ = 456289879040.

The previous prime is 1212020020091. The next prime is 1212020020147. The reversal of 1212020020100 is 10200202121.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 282079956544 + 929940063556 = 531112^2 + 964334^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20940305 + ... + 20998104.

Almost surely, 2^{1212020020100} is an apocalyptic number.

1212020020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212020020100 is an abundant number, since it is smaller than the sum of its proper divisors (1581874915690).

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

1212020020100 is a wasteful number, since it uses less digits than its factorization.

1212020020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41938457 (or 41938433 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1212020020100 its reverse (10200202121), we get a palindrome (1222220222221).

The spelling of 1212020020100 in words is "one trillion, two hundred twelve billion, twenty million, twenty thousand, one hundred".