23672821 has 4 divisors (see below), whose sum is σ = 24119532. Its totient is φ = 23226112.

The previous prime is 23672813. The next prime is 23672827. The reversal of 23672821 is 12827632.

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 5948721 + 17724100 = 2439^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 23672821 - 2³ = 23672813 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 (23672827) 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, 223276 + ... + 223381.

It is an arithmetic number, because the mean of its divisors is an integer number (6029883).

Almost surely, 2^23672821 is an apocalyptic number.

It is an amenable number.

23672821 is a deficient number, since it is larger than the sum of its proper divisors (446711).

23672821 is an equidigital number, since it uses as much as digits as its factorization.

23672821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446710.

The product of its digits is 8064, while the sum is 31.

The square root of 23672821 is about 4865.4723306170. The cubic root of 23672821 is about 287.1331517627.

The spelling of 23672821 in words is "twenty-three million, six hundred seventy-two thousand, eight hundred twenty-one".