21369005393 has 16 divisors (see below), whose sum is σ = 23057986176. Its totient is φ = 19754866560.

The previous prime is 21369005369. The next prime is 21369005407. The reversal of 21369005393 is 39350096312.

It is a cyclic number.

It is not a de Polignac number, because 21369005393 - 2¹⁶ = 21368939857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21369005393.

It is not an unprimeable number, because it can be changed into a prime (21369005303) 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 in 15 ways as a sum of consecutive naturals, for example, 49148 + ... + 212493.

It is an arithmetic number, because the mean of its divisors is an integer number (1441124136).

Almost surely, 2^21369005393 is an apocalyptic number.

21369005393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21369005393 is a deficient number, since it is larger than the sum of its proper divisors (1688980783).

21369005393 is a wasteful number, since it uses less digits than its factorization.

21369005393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261784.

The product of its (nonzero) digits is 131220, while the sum is 41.

The spelling of 21369005393 in words is "twenty-one billion, three hundred sixty-nine million, five thousand, three hundred ninety-three".