2721381247 has 4 divisors (see below), whose sum is σ = 2930718280. Its totient is φ = 2512044216.

The previous prime is 2721381241. The next prime is 2721381307. The reversal of 2721381247 is 7421831272.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2721381247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721381241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104668497 + ... + 104668522.

It is an arithmetic number, because the mean of its divisors is an integer number (732679570).

Almost surely, 2^2721381247 is an apocalyptic number.

2721381247 is a deficient number, since it is larger than the sum of its proper divisors (209337033).

2721381247 is a wasteful number, since it uses less digits than its factorization.

2721381247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209337032.

The product of its digits is 37632, while the sum is 37.

The square root of 2721381247 is about 52166.8596620498. The cubic root of 2721381247 is about 1396.1426551248.

The spelling of 2721381247 in words is "two billion, seven hundred twenty-one million, three hundred eighty-one thousand, two hundred forty-seven".