23015221 has 8 divisors (see below), whose sum is σ = 23963864. Its totient is φ = 22083840.

The previous prime is 23015207. The next prime is 23015233. The reversal of 23015221 is 12251032.

It can be written as a sum of positive squares in 4 ways, for example, as 8346321 + 14668900 = 2889^2 + 3830^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23015221 - 2¹¹ = 23013173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23015195 and 23015204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23015261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1560 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (2995483).

Almost surely, 2^23015221 is an apocalyptic number.

It is an amenable number.

23015221 is a deficient number, since it is larger than the sum of its proper divisors (948643).

23015221 is an equidigital number, since it uses as much as digits as its factorization.

23015221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8631.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 23015221 is about 4797.4181598022. The cubic root of 23015221 is about 284.4494182084.

Adding to 23015221 its reverse (12251032), we get a palindrome (35266253).

It can be divided in two parts, 230 and 15221, that added together give a palindrome (15451).

The spelling of 23015221 in words is "twenty-three million, fifteen thousand, two hundred twenty-one".