2117031721928 has 36 divisors (see below), whose sum is σ = 4038316506315. Its totient is φ = 1040455568496.

The previous prime is 2117031721841. The next prime is 2117031721943. The reversal of 2117031721928 is 8291271307112.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 1058515860964 + 1058515860964 = 1028842^2 + 1028842^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1028842.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 242802353 + ... + 242811071.

Almost surely, 2^{2117031721928} is an apocalyptic number.

It is an amenable number.

2117031721928 is a deficient number, since it is larger than the sum of its proper divisors (1921284784387).

2117031721928 is an frugal number, since it uses more digits than its factorization.

2117031721928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17562 (or 8780 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 2117031721928 in words is "two trillion, one hundred seventeen billion, thirty-one million, seven hundred twenty-one thousand, nine hundred twenty-eight".