23651021 has 2 divisors, whose sum is σ = 23651022. Its totient is φ = 23651020.

The previous prime is 23651009. The next prime is 23651057. The reversal of 23651021 is 12015632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21058921 + 2592100 = 4589^2 + 1610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23651021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23650984 and 23651002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23651071) 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 as a sum of consecutive naturals, namely, 11825510 + 11825511.

It is an arithmetic number, because the mean of its divisors is an integer number (11825511).

Almost surely, 2^23651021 is an apocalyptic number.

It is an amenable number.

23651021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23651021 is an equidigital number, since it uses as much as digits as its factorization.

23651021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 23651021 is about 4863.2315388022. The cubic root of 23651021 is about 287.0449856034.

Adding to 23651021 its reverse (12015632), we get a palindrome (35666653).

The spelling of 23651021 in words is "twenty-three million, six hundred fifty-one thousand, twenty-one".