2721247155 has 24 divisors (see below), whose sum is σ = 5145631920. Its totient is φ = 1319392320.

The previous prime is 2721247153. The next prime is 2721247183. The reversal of 2721247155 is 5517421272.

It is not a de Polignac number, because 2721247155 - 2¹ = 2721247153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2721247153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2748240 + ... + 2749229.

It is an arithmetic number, because the mean of its divisors is an integer number (214401330).

Almost surely, 2^2721247155 is an apocalyptic number.

2721247155 is a deficient number, since it is larger than the sum of its proper divisors (2424384765).

2721247155 is a wasteful number, since it uses less digits than its factorization.

2721247155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5497491 (or 5497488 counting only the distinct ones).

The product of its digits is 39200, while the sum is 36.

The square root of 2721247155 is about 52165.5744241353. The cubic root of 2721247155 is about 1396.1197237995.

The spelling of 2721247155 in words is "two billion, seven hundred twenty-one million, two hundred forty-seven thousand, one hundred fifty-five".