2125721921808 has 40 divisors (see below), whose sum is σ = 5504874872800. Its totient is φ = 706841512704.

The previous prime is 2125721921803. The next prime is 2125721921809. The reversal of 2125721921808 is 8081291275212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (2125721921803) by changing a digit.

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, 54119578 + ... + 54158841.

It is an arithmetic number, because the mean of its divisors is an integer number (137621871820).

Almost surely, 2^{2125721921808} is an apocalyptic number.

It is an amenable number.

2125721921808 is an abundant number, since it is smaller than the sum of its proper divisors (3379152950992).

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

2125721921808 is a wasteful number, since it uses less digits than its factorization.

2125721921808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108278839 (or 108278833 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 48.

The spelling of 2125721921808 in words is "two trillion, one hundred twenty-five billion, seven hundred twenty-one million, nine hundred twenty-one thousand, eight hundred eight".