2121123202120 has 32 divisors (see below), whose sum is σ = 5139644683320. Its totient is φ = 783183951360.

The previous prime is 2121123202117. The next prime is 2121123202153. The reversal of 2121123202120 is 212023211212.

It can be written as a sum of positive squares in 4 ways, for example, as 1525012587396 + 596110614724 = 1234914^2 + 772082^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2039541021 + ... + 2039542060.

Almost surely, 2^{2121123202120} is an apocalyptic number.

2121123202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121123202120 is an abundant number, since it is smaller than the sum of its proper divisors (3018521481200).

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

2121123202120 is a wasteful number, since it uses less digits than its factorization.

2121123202120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079083105 (or 4079083101 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2121123202120 its reverse (212023211212), we get a palindrome (2333146413332).

The spelling of 2121123202120 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred two thousand, one hundred twenty".