23523821 has 2 divisors, whose sum is σ = 23523822. Its totient is φ = 23523820.

The previous prime is 23523817. The next prime is 23523827. The reversal of 23523821 is 12832532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21058921 + 2464900 = 4589^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 23523821 - 2² = 23523817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23523827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11761910 + 11761911.

It is an arithmetic number, because the mean of its divisors is an integer number (11761911).

Almost surely, 2^23523821 is an apocalyptic number.

It is an amenable number.

23523821 is a deficient number, since it is larger than the sum of its proper divisors (1).

23523821 is an equidigital number, since it uses as much as digits as its factorization.

23523821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 23523821 is about 4850.1361836551. The cubic root of 23523821 is about 286.5294648712.

The spelling of 23523821 in words is "twenty-three million, five hundred twenty-three thousand, eight hundred twenty-one".