21342663265 has 64 divisors (see below), whose sum is σ = 32196722688. Its totient is φ = 13194316800.

The previous prime is 21342663247. The next prime is 21342663337. The reversal of 21342663265 is 56236624312.

It is not a de Polignac number, because 21342663265 - 2⁵ = 21342663233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 63 ways as a sum of consecutive naturals, for example, 35160592 + ... + 35161198.

It is an arithmetic number, because the mean of its divisors is an integer number (503073792).

Almost surely, 2^21342663265 is an apocalyptic number.

It is an amenable number.

21342663265 is a deficient number, since it is larger than the sum of its proper divisors (10854059423).

21342663265 is a wasteful number, since it uses less digits than its factorization.

21342663265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238.

The product of its digits is 311040, while the sum is 40.

The spelling of 21342663265 in words is "twenty-one billion, three hundred forty-two million, six hundred sixty-three thousand, two hundred sixty-five".