2171628733 has 4 divisors (see below), whose sum is σ = 2177044668. Its totient is φ = 2166212800.

The previous prime is 2171628727. The next prime is 2171628761. The reversal of 2171628733 is 3378261712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1988892409 + 182736324 = 44597^2 + 13518^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171628733 - 2¹³ = 2171620541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171628713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2707366 + ... + 2708167.

It is an arithmetic number, because the mean of its divisors is an integer number (544261167).

Almost surely, 2^2171628733 is an apocalyptic number.

It is an amenable number.

2171628733 is a deficient number, since it is larger than the sum of its proper divisors (5415935).

2171628733 is an equidigital number, since it uses as much as digits as its factorization.

2171628733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5415934.

The product of its digits is 84672, while the sum is 40.

The square root of 2171628733 is about 46600.7374727053. The cubic root of 2171628733 is about 1294.9764177317.

The spelling of 2171628733 in words is "two billion, one hundred seventy-one million, six hundred twenty-eight thousand, seven hundred thirty-three".