23001221 has 6 divisors (see below), whose sum is σ = 24434130. Its totient is φ = 21647936.

The previous prime is 23001211. The next prime is 23001227. The reversal of 23001221 is 12210032.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6100900 + 16900321 = 2470^2 + 4111^2 .

It is not a de Polignac number, because 23001221 - 2⁶ = 23001157 is a prime.

It is a Duffinian number.

23001221 is a modest number, since divided by 1221 gives 23 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23001227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39506 + ... + 40083.

It is an arithmetic number, because the mean of its divisors is an integer number (4072355).

Almost surely, 2^23001221 is an apocalyptic number.

It is an amenable number.

23001221 is a deficient number, since it is larger than the sum of its proper divisors (1432909).

23001221 is an equidigital number, since it uses as much as digits as its factorization.

23001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79623 (or 79606 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 23001221 is about 4795.9588196731. The cubic root of 23001221 is about 284.3917303042.

Adding to 23001221 its reverse (12210032), we get a palindrome (35211253).

The spelling of 23001221 in words is "twenty-three million, one thousand, two hundred twenty-one".