2721038573138 has 6 divisors (see below), whose sum is σ = 4081561358949. Its totient is φ = 1360518120156.

The previous prime is 2721038573107. The next prime is 2721038573159. The reversal of 2721038573138 is 8313758301272.

It can be written as a sum of positive squares in 2 ways, for example, as 2719883728849 + 1154844289 = 1649207^2 + 33983^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1166413.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1749620 + ... + 2916032.

Almost surely, 2^{2721038573138} is an apocalyptic number.

2721038573138 is a deficient number, since it is larger than the sum of its proper divisors (1360522785811).

2721038573138 is an frugal number, since it uses more digits than its factorization.

2721038573138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332828 (or 1166415 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

Multiplying 2721038573138 by its sum of digits (50), we get a square (136051928656900 = 11664130²).

The spelling of 2721038573138 in words is "two trillion, seven hundred twenty-one billion, thirty-eight million, five hundred seventy-three thousand, one hundred thirty-eight".