1212121202120 has 16 divisors (see below), whose sum is σ = 2727272704860. Its totient is φ = 484848480832.

The previous prime is 1212121202107. The next prime is 1212121202129. The reversal of 1212121202120 is 212021212121.

It can be written as a sum of positive squares in 2 ways, for example, as 1071800537284 + 140320664836 = 1035278^2 + 374594^2 .

It is not an unprimeable number, because it can be changed into a prime (1212121202129) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15151514987 + ... + 15151515066.

Almost surely, 2^{1212121202120} is an apocalyptic number.

1212121202120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121202120 is an abundant number, since it is smaller than the sum of its proper divisors (1515151502740).

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

1212121202120 is a wasteful number, since it uses less digits than its factorization.

1212121202120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30303030064 (or 30303030060 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212121202120 its reverse (212021212121), we get a palindrome (1424142414241).

The spelling of 1212121202120 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty".