21183553876391 has 4 divisors (see below), whose sum is σ = 21183664803000. Its totient is φ = 21183442949784.

The previous prime is 21183553876369. The next prime is 21183553876411. The reversal of 21183553876391 is 19367835538112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21183553876391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21183553806391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55176356 + ... + 55558953.

It is an arithmetic number, because the mean of its divisors is an integer number (5295916200750).

Almost surely, 2^{21183553876391} is an apocalyptic number.

21183553876391 is a deficient number, since it is larger than the sum of its proper divisors (110926609).

21183553876391 is a wasteful number, since it uses less digits than its factorization.

21183553876391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110926608.

The product of its digits is 32659200, while the sum is 62.

The spelling of 21183553876391 in words is "twenty-one trillion, one hundred eighty-three billion, five hundred fifty-three million, eight hundred seventy-six thousand, three hundred ninety-one".