23542221 has 4 divisors (see below), whose sum is σ = 31389632. Its totient is φ = 15694812.

The previous prime is 23542219. The next prime is 23542243. The reversal of 23542221 is 12224532.

23542221 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23542221 - 2¹ = 23542219 is a prime.

It is a super-2 number, since 2×23542221² = 1108472339225682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23542021) 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, 3923701 + ... + 3923706.

It is an arithmetic number, because the mean of its divisors is an integer number (7847408).

Almost surely, 2^23542221 is an apocalyptic number.

It is an amenable number.

23542221 is a deficient number, since it is larger than the sum of its proper divisors (7847411).

23542221 is an equidigital number, since it uses as much as digits as its factorization.

23542221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7847410.

The product of its digits is 960, while the sum is 21.

The square root of 23542221 is about 4852.0326668315. The cubic root of 23542221 is about 286.6041518329.

Adding to 23542221 its reverse (12224532), we get a palindrome (35766753).

The spelling of 23542221 in words is "twenty-three million, five hundred forty-two thousand, two hundred twenty-one".