23142421 has 2 divisors, whose sum is σ = 23142422. Its totient is φ = 23142420.

The previous prime is 23142419. The next prime is 23142463. The reversal of 23142421 is 12424132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15689521 + 7452900 = 3961^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 23142421 - 2¹ = 23142419 is a prime.

Together with 23142419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23142481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11571210 + 11571211.

It is an arithmetic number, because the mean of its divisors is an integer number (11571211).

Almost surely, 2^23142421 is an apocalyptic number.

It is an amenable number.

23142421 is a deficient number, since it is larger than the sum of its proper divisors (1).

23142421 is an equidigital number, since it uses as much as digits as its factorization.

23142421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 23142421 is about 4810.6570237339. The cubic root of 23142421 is about 284.9724852887.

Adding to 23142421 its reverse (12424132), we get a palindrome (35566553).

The spelling of 23142421 in words is "twenty-three million, one hundred forty-two thousand, four hundred twenty-one".