21146542521064 has 32 divisors (see below), whose sum is σ = 41017286169000. Its totient is φ = 10208604620032.

The previous prime is 21146542521011. The next prime is 21146542521127. The reversal of 21146542521064 is 46012524564112.

It can be written as a sum of positive squares in 4 ways, for example, as 11586140360964 + 9560402160100 = 3403842^2 + 3091990^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21146542521064.

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, 50746422 + ... + 51161434.

Almost surely, 2^{21146542521064} is an apocalyptic number.

It is an amenable number.

21146542521064 is a deficient number, since it is larger than the sum of its proper divisors (19870743647936).

21146542521064 is a wasteful number, since it uses less digits than its factorization.

21146542521064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634677 (or 634673 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 43.

The spelling of 21146542521064 in words is "twenty-one trillion, one hundred forty-six billion, five hundred forty-two million, five hundred twenty-one thousand, sixty-four".