164060821 has 4 divisors (see below), whose sum is σ = 164105644. Its totient is φ = 164016000.

The previous prime is 164060797. The next prime is 164060843. The reversal of 164060821 is 128060461.

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 85932900 + 78127921 = 9270^2 + 8839^2 .

It is a cyclic number.

It is not a de Polignac number, because 164060821 - 2⁵ = 164060789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164060821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164060851) 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, 16380 + ... + 24421.

It is an arithmetic number, because the mean of its divisors is an integer number (41026411).

Almost surely, 2^164060821 is an apocalyptic number.

It is an amenable number.

164060821 is a deficient number, since it is larger than the sum of its proper divisors (44823).

164060821 is an equidigital number, since it uses as much as digits as its factorization.

164060821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44822.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 164060821 is about 12808.6229158329. The cubic root of 164060821 is about 547.4380249970.

The spelling of 164060821 in words is "one hundred sixty-four million, sixty thousand, eight hundred twenty-one".