2721185387345 has 8 divisors (see below), whose sum is σ = 3265432158120. Its totient is φ = 2176941847680.

The previous prime is 2721185387309. The next prime is 2721185387369. The reversal of 2721185387345 is 5437835811272.

It is a happy number.

2721185387345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12978677776 + 2708206709569 = 113924^2 + 1645663^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2721185387345 - 2³⁰ = 2720111645521 is a prime.

It is a super-2 number, since 2×2721185387345² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1825301 + ... + 2962109.

It is an arithmetic number, because the mean of its divisors is an integer number (408179019765).

Almost surely, 2^{2721185387345} is an apocalyptic number.

It is an amenable number.

2721185387345 is a deficient number, since it is larger than the sum of its proper divisors (544246770775).

2721185387345 is a wasteful number, since it uses less digits than its factorization.

2721185387345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615555.

The product of its digits is 11289600, while the sum is 56.

The spelling of 2721185387345 in words is "two trillion, seven hundred twenty-one billion, one hundred eighty-five million, three hundred eighty-seven thousand, three hundred forty-five".