23210021 has 2 divisors, whose sum is σ = 23210022. Its totient is φ = 23210020.

The previous prime is 23210017. The next prime is 23210053. The reversal of 23210021 is 12001232.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17757796 + 5452225 = 4214^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 23210021 - 2² = 23210017 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23209984 and 23210011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23210071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11605010 + 11605011.

It is an arithmetic number, because the mean of its divisors is an integer number (11605011).

Almost surely, 2^23210021 is an apocalyptic number.

It is an amenable number.

23210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23210021 is an equidigital number, since it uses as much as digits as its factorization.

23210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 23210021 is about 4817.6779676521. The cubic root of 23210021 is about 285.2496878231.

Adding to 23210021 its reverse (12001232), we get a palindrome (35211253).

The spelling of 23210021 in words is "twenty-three million, two hundred ten thousand, twenty-one".