2100123121420 has 48 divisors (see below), whose sum is σ = 4469569896960. Its totient is φ = 828768447936.

The previous prime is 2100123121391. The next prime is 2100123121457. The reversal of 2100123121420 is 241213210012.

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 15 ways as a sum of consecutive naturals, for example, 1509139 + ... + 2545141.

It is an arithmetic number, because the mean of its divisors is an integer number (93116039520).

Almost surely, 2^{2100123121420} is an apocalyptic number.

2100123121420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100123121420 is an abundant number, since it is smaller than the sum of its proper divisors (2369446775540).

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

2100123121420 is a wasteful number, since it uses less digits than its factorization.

2100123121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037374 (or 1037372 counting only the distinct ones).

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

Adding to 2100123121420 its reverse (241213210012), we get a palindrome (2341336331432).

The spelling of 2100123121420 in words is "two trillion, one hundred billion, one hundred twenty-three million, one hundred twenty-one thousand, four hundred twenty".