21265652423 has 2 divisors, whose sum is σ = 21265652424. Its totient is φ = 21265652422.

The previous prime is 21265652407. The next prime is 21265652437. The reversal of 21265652423 is 32425656212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21265652423 - 2⁴ = 21265652407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21265652453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10632826211 + 10632826212.

It is an arithmetic number, because the mean of its divisors is an integer number (10632826212).

Almost surely, 2^21265652423 is an apocalyptic number.

21265652423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21265652423 is an equidigital number, since it uses as much as digits as its factorization.

21265652423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 38.

The spelling of 21265652423 in words is "twenty-one billion, two hundred sixty-five million, six hundred fifty-two thousand, four hundred twenty-three".