2121121020020 has 24 divisors (see below), whose sum is σ = 4508021062944. Its totient is φ = 838226137376.

The previous prime is 2121121020001. The next prime is 2121121020097. The reversal of 2121121020020 is 200201211212.

It is a junction number, because it is equal to n+sod(n) for n = 2121121019977 and 2121121020004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638890214 + ... + 638893533.

It is an arithmetic number, because the mean of its divisors is an integer number (187834210956).

Almost surely, 2^{2121121020020} is an apocalyptic number.

2121121020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121121020020 is an abundant number, since it is smaller than the sum of its proper divisors (2386900042924).

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

2121121020020 is a wasteful number, since it uses less digits than its factorization.

2121121020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277783839 (or 1277783837 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2121121020020 its reverse (200201211212), we get a palindrome (2321322231232).

The spelling of 2121121020020 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, twenty thousand, twenty".