23021213 has 8 divisors (see below), whose sum is σ = 24970680. Its totient is φ = 21137920.

The previous prime is 23021203. The next prime is 23021227. The reversal of 23021213 is 31212032.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 344569 + 22676644 = 587^2 + 4762^2 .

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 23021213 - 2⁶ = 23021149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15818 + ... + 17211.

It is an arithmetic number, because the mean of its divisors is an integer number (3121335).

Almost surely, 2^23021213 is an apocalyptic number.

It is an amenable number.

23021213 is a deficient number, since it is larger than the sum of its proper divisors (1949467).

23021213 is a wasteful number, since it uses less digits than its factorization.

23021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33087.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 23021213 is about 4798.0426217365. The cubic root of 23021213 is about 284.4741014825.

Adding to 23021213 its reverse (31212032), we get a palindrome (54233245).

The spelling of 23021213 in words is "twenty-three million, twenty-one thousand, two hundred thirteen".