2121644643125 has 40 divisors (see below), whose sum is σ = 3031432631040. Its totient is φ = 1454130648000.

The previous prime is 2121644643073. The next prime is 2121644643137. The reversal of 2121644643125 is 5213464461212.

It is not a de Polignac number, because 2121644643125 - 2⁶ = 2121644643061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8908091 + ... + 9143159.

It is an arithmetic number, because the mean of its divisors is an integer number (75785815776).

Almost surely, 2^{2121644643125} is an apocalyptic number.

2121644643125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121644643125 is a deficient number, since it is larger than the sum of its proper divisors (909787987915).

2121644643125 is an equidigital number, since it uses as much as digits as its factorization.

2121644643125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237159 (or 237144 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The spelling of 2121644643125 in words is "two trillion, one hundred twenty-one billion, six hundred forty-four million, six hundred forty-three thousand, one hundred twenty-five".