2164472642721 has 16 divisors (see below), whose sum is σ = 2888366413568. Its totient is φ = 1441780819200.

The previous prime is 2164472642719. The next prime is 2164472642753. The reversal of 2164472642721 is 1272462744612.

It is a happy number.

It is not a de Polignac number, because 2164472642721 - 2¹ = 2164472642719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2164472642791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17878131 + ... + 17998791.

It is an arithmetic number, because the mean of its divisors is an integer number (180522900848).

Almost surely, 2^{2164472642721} is an apocalyptic number.

It is an amenable number.

2164472642721 is a deficient number, since it is larger than the sum of its proper divisors (723893770847).

2164472642721 is a wasteful number, since it uses less digits than its factorization.

2164472642721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125592.

The product of its digits is 1806336, while the sum is 48.

The spelling of 2164472642721 in words is "two trillion, one hundred sixty-four billion, four hundred seventy-two million, six hundred forty-two thousand, seven hundred twenty-one".