23206021 has 2 divisors, whose sum is σ = 23206022. Its totient is φ = 23206020.

The previous prime is 23205977. The next prime is 23206031. The reversal of 23206021 is 12060232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14737921 + 8468100 = 3839^2 + 2910^2 .

It is a cyclic number.

It is not a de Polignac number, because 23206021 - 2¹³ = 23197829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23205986 and 23206004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23206031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11603010 + 11603011.

It is an arithmetic number, because the mean of its divisors is an integer number (11603011).

Almost surely, 2^23206021 is an apocalyptic number.

It is an amenable number.

23206021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23206021 is an equidigital number, since it uses as much as digits as its factorization.

23206021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 23206021 is about 4817.2628120126. The cubic root of 23206021 is about 285.2333002995.

Adding to 23206021 its reverse (12060232), we get a palindrome (35266253).

It can be divided in two parts, 2 and 3206021, that added together give a palindrome (3206023).

The spelling of 23206021 in words is "twenty-three million, two hundred six thousand, twenty-one".