23071221 has 12 divisors (see below), whose sum is σ = 33409740. Its totient is φ = 15341760.

The previous prime is 23071199. The next prime is 23071229. The reversal of 23071221 is 12217032.

It can be written as a sum of positive squares in 2 ways, for example, as 1782225 + 21288996 = 1335^2 + 4614^2 .

It is not a de Polignac number, because 23071221 - 2⁵ = 23071189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23071194 and 23071203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23071229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 745 + ... + 6833.

It is an arithmetic number, because the mean of its divisors is an integer number (2784145).

Almost surely, 2^23071221 is an apocalyptic number.

It is an amenable number.

23071221 is a deficient number, since it is larger than the sum of its proper divisors (10338519).

23071221 is a wasteful number, since it uses less digits than its factorization.

23071221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6516 (or 6513 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 23071221 is about 4803.2510865038. The cubic root of 23071221 is about 284.6799361685.

Adding to 23071221 its reverse (12217032), we get a palindrome (35288253).

The spelling of 23071221 in words is "twenty-three million, seventy-one thousand, two hundred twenty-one".