23213511 has 12 divisors (see below), whose sum is σ = 33648888. Its totient is φ = 15421104.

The previous prime is 23213479. The next prime is 23213527. The reversal of 23213511 is 11531232.

It is not a de Polignac number, because 23213511 - 2⁵ = 23213479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23213581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1765 + ... + 7038.

It is an arithmetic number, because the mean of its divisors is an integer number (2804074).

Almost surely, 2^23213511 is an apocalyptic number.

23213511 is a deficient number, since it is larger than the sum of its proper divisors (10435377).

23213511 is a wasteful number, since it uses less digits than its factorization.

23213511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9102 (or 9099 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 23213511 is about 4818.0401617255. The cubic root of 23213511 is about 285.2639843996.

Adding to 23213511 its reverse (11531232), we get a palindrome (34744743).

It can be divided in two parts, 2321 and 3511, that added together give a cube (5832 = 18³).

The spelling of 23213511 in words is "twenty-three million, two hundred thirteen thousand, five hundred eleven".