2721156723 has 6 divisors (see below), whose sum is σ = 3930559724. Its totient is φ = 1814104476.

The previous prime is 2721156709. The next prime is 2721156751. The reversal of 2721156723 is 3276511272.

2721156723 is a `hidden beast` number, since 2 + 72 + 1 + 1 + 567 + 23 = 666.

It is not a de Polignac number, because 2721156723 - 2⁹ = 2721156211 is a prime.

It is a super-2 number, since 2×2721156723² = 14809387822256197458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2721152723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151175365 + ... + 151175382.

Almost surely, 2^2721156723 is an apocalyptic number.

2721156723 is a deficient number, since it is larger than the sum of its proper divisors (1209403001).

2721156723 is a wasteful number, since it uses less digits than its factorization.

2721156723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302350753 (or 302350750 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 2721156723 is about 52164.7076384024. The cubic root of 2721156723 is about 1396.1042584277.

Adding to 2721156723 its reverse (3276511272), we get a palindrome (5997667995).

The spelling of 2721156723 in words is "two billion, seven hundred twenty-one million, one hundred fifty-six thousand, seven hundred twenty-three".