21544357011 has 16 divisors (see below), whose sum is σ = 28947157248. Its totient is φ = 14252436000.

The previous prime is 21544357007. The next prime is 21544357019. The reversal of 21544357011 is 11075344512.

It is not a de Polignac number, because 21544357011 - 2² = 21544357007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21544357019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403881 + ... + 454101.

It is an arithmetic number, because the mean of its divisors is an integer number (1809197328).

Almost surely, 2^21544357011 is an apocalyptic number.

21544357011 is a deficient number, since it is larger than the sum of its proper divisors (7402800237).

21544357011 is a wasteful number, since it uses less digits than its factorization.

21544357011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51322.

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 21544357011 in words is "twenty-one billion, five hundred forty-four million, three hundred fifty-seven thousand, eleven".