2156723701 has 16 divisors (see below), whose sum is σ = 2402769600. Its totient is φ = 1919289600.

The previous prime is 2156723693. The next prime is 2156723711. The reversal of 2156723701 is 1073276512.

It is a cyclic number.

It is not a de Polignac number, because 2156723701 - 2³ = 2156723693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156723711) 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 in 15 ways as a sum of consecutive naturals, for example, 149515 + ... + 163303.

It is an arithmetic number, because the mean of its divisors is an integer number (150173100).

Almost surely, 2^2156723701 is an apocalyptic number.

It is an amenable number.

2156723701 is a deficient number, since it is larger than the sum of its proper divisors (246045899).

2156723701 is a wasteful number, since it uses less digits than its factorization.

2156723701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14100.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 2156723701 is about 46440.5394133186. The cubic root of 2156723701 is about 1292.0069117916.

The spelling of 2156723701 in words is "two billion, one hundred fifty-six million, seven hundred twenty-three thousand, seven hundred one".