2721863137249 has 3 divisors (see below), whose sum is σ = 2721864787057. Its totient is φ = 2721861487442.

The previous prime is 2721863137247. The next prime is 2721863137291. The reversal of 2721863137249 is 9427313681272.

The square root of 2721863137249 is 1649807.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2721863137249 - 2¹ = 2721863137247 is a prime.

It is a super-2 number, since 2×2721863137249² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2721863137249.

It is not an unprimeable number, because it can be changed into a prime (2721863137241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 824904 + ... + 2474710.

Almost surely, 2^{2721863137249} is an apocalyptic number.

2721863137249 is the 1649807-th square number.

2721863137249 is the 824904-th centered octagonal number.

It is an amenable number.

2721863137249 is a deficient number, since it is larger than the sum of its proper divisors (1649808).

2721863137249 is an frugal number, since it uses more digits than its factorization.

2721863137249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299614 (or 1649807 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 55.

The spelling of 2721863137249 in words is "two trillion, seven hundred twenty-one billion, eight hundred sixty-three million, one hundred thirty-seven thousand, two hundred forty-nine".