23213145 has 8 divisors (see below), whose sum is σ = 37141056. Its totient is φ = 12380336.

The previous prime is 23213131. The next prime is 23213147. The reversal of 23213145 is 54131232.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23213145 - 2¹⁹ = 22688857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23213147) 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 7 ways as a sum of consecutive naturals, for example, 773757 + ... + 773786.

It is an arithmetic number, because the mean of its divisors is an integer number (4642632).

Almost surely, 2^23213145 is an apocalyptic number.

It is an amenable number.

23213145 is a deficient number, since it is larger than the sum of its proper divisors (13927911).

23213145 is a wasteful number, since it uses less digits than its factorization.

23213145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547551.

The product of its digits is 720, while the sum is 21.

The square root of 23213145 is about 4818.0021793270. The cubic root of 23213145 is about 285.2624851697.

Subtracting from 23213145 its sum of digits (21), we obtain a square (23213124 = 4818²).

Adding to 23213145 its reverse (54131232), we get a palindrome (77344377).

The spelling of 23213145 in words is "twenty-three million, two hundred thirteen thousand, one hundred forty-five".