2721247156 has 6 divisors (see below), whose sum is σ = 4762182530. Its totient is φ = 1360623576.

The previous prime is 2721247153. The next prime is 2721247183. The reversal of 2721247156 is 6517421272.

It can be written as a sum of positive squares in only one way, i.e., 2510010000 + 211237156 = 50100^2 + 14534^2 .

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340155891 + ... + 340155898.

Almost surely, 2^2721247156 is an apocalyptic number.

It is an amenable number.

2721247156 is a deficient number, since it is larger than the sum of its proper divisors (2040935374).

2721247156 is a wasteful number, since it uses less digits than its factorization.

2721247156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680311793 (or 680311791 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 2721247156 is about 52165.5744337202. The cubic root of 2721247156 is about 1396.1197239706.

The spelling of 2721247156 in words is "two billion, seven hundred twenty-one million, two hundred forty-seven thousand, one hundred fifty-six".