21410423 has 2 divisors, whose sum is σ = 21410424. Its totient is φ = 21410422.

The previous prime is 21410419. The next prime is 21410437. The reversal of 21410423 is 32401412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21410423 - 2² = 21410419 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21410023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705211 + 10705212.

It is an arithmetic number, because the mean of its divisors is an integer number (10705212).

Almost surely, 2^21410423 is an apocalyptic number.

21410423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21410423 is an equidigital number, since it uses as much as digits as its factorization.

21410423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21410423 is about 4627.1398293114. The cubic root of 21410423 is about 277.6781768362.

Adding to 21410423 its reverse (32401412), we get a palindrome (53811835).

The spelling of 21410423 in words is "twenty-one million, four hundred ten thousand, four hundred twenty-three".