21288755676534 has 16 divisors (see below), whose sum is σ = 42577563034560. Its totient is φ = 7096243278600.

The previous prime is 21288755676521. The next prime is 21288755676589. The reversal of 21288755676534 is 43567655788212.

It is a super-2 number, since 2×21288755676534² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5060637 + ... + 8257575.

It is an arithmetic number, because the mean of its divisors is an integer number (2661097689660).

Almost surely, 2^{21288755676534} is an apocalyptic number.

21288755676534 is an abundant number, since it is smaller than the sum of its proper divisors (21288807358026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21288755676534 is a wasteful number, since it uses less digits than its factorization.

21288755676534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4306795.

The product of its digits is 677376000, while the sum is 69.

The spelling of 21288755676534 in words is "twenty-one trillion, two hundred eighty-eight billion, seven hundred fifty-five million, six hundred seventy-six thousand, five hundred thirty-four".