23542021 has 2 divisors, whose sum is σ = 23542022. Its totient is φ = 23542020.

The previous prime is 23542019. The next prime is 23542031. The reversal of 23542021 is 12024532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 3381921 = 4490^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 23542021 - 2¹ = 23542019 is a prime.

Together with 23542019, it forms a pair of twin primes.

It is equal to p_1480204 and since 23542021 and 1480204 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23542021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23542031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11771010 + 11771011.

It is an arithmetic number, because the mean of its divisors is an integer number (11771011).

Almost surely, 2^23542021 is an apocalyptic number.

It is an amenable number.

23542021 is a deficient number, since it is larger than the sum of its proper divisors (1).

23542021 is an equidigital number, since it uses as much as digits as its factorization.

23542021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 23542021 is about 4852.0120568688. The cubic root of 23542021 is about 286.6033402273.

Adding to 23542021 its reverse (12024532), we get a palindrome (35566553).

The spelling of 23542021 in words is "twenty-three million, five hundred forty-two thousand, twenty-one".