23121236 has 12 divisors (see below), whose sum is σ = 41857620. Its totient is φ = 11161920.

The previous prime is 23121209. The next prime is 23121247. The reversal of 23121236 is 63212132.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18541636 + 4579600 = 4306^2 + 2140^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 99545 + ... + 99776.

It is an arithmetic number, because the mean of its divisors is an integer number (3488135).

Almost surely, 2^23121236 is an apocalyptic number.

It is an amenable number.

23121236 is a deficient number, since it is larger than the sum of its proper divisors (18736384).

23121236 is a wasteful number, since it uses less digits than its factorization.

23121236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199354 (or 199352 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 23121236 is about 4808.4546374069. The cubic root of 23121236 is about 284.8855023811.

Adding to 23121236 its reverse (63212132), we get a palindrome (86333368).

It can be divided in two parts, 23121 and 236, that multiplied together give a triangular number (5456556 = T₃₃₀₃).

The spelling of 23121236 in words is "twenty-three million, one hundred twenty-one thousand, two hundred thirty-six".