23235521 has 2 divisors, whose sum is σ = 23235522. Its totient is φ = 23235520.

The previous prime is 23235517. The next prime is 23235551. The reversal of 23235521 is 12553232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 4840000 = 4289^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 23235521 - 2² = 23235517 is a prime.

It is a super-2 number, since 2×23235521² = 1079778872282882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23235551) 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 as a sum of consecutive naturals, namely, 11617760 + 11617761.

It is an arithmetic number, because the mean of its divisors is an integer number (11617761).

Almost surely, 2^23235521 is an apocalyptic number.

It is an amenable number.

23235521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23235521 is an equidigital number, since it uses as much as digits as its factorization.

23235521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 23.

The square root of 23235521 is about 4820.3237443143. The cubic root of 23235521 is about 285.3541140509.

Adding to 23235521 its reverse (12553232), we get a palindrome (35788753).

It can be divided in two parts, 232 and 35521, that added together give a palindrome (35753).

The spelling of 23235521 in words is "twenty-three million, two hundred thirty-five thousand, five hundred twenty-one".