21041564211 has 32 divisors (see below), whose sum is σ = 31353600000. Its totient is φ = 13946533344.

The previous prime is 21041564197. The next prime is 21041564263. The reversal of 21041564211 is 11246514012.

21041564211 is a `hidden beast` number, since 2 + 1 + 0 + 4 + 1 + 5 + 642 + 11 = 666.

It is not a de Polignac number, because 21041564211 - 2²² = 21037369907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21041564281) 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 31 ways as a sum of consecutive naturals, for example, 3657165 + ... + 3662913.

It is an arithmetic number, because the mean of its divisors is an integer number (979800000).

Almost surely, 2^21041564211 is an apocalyptic number.

21041564211 is a deficient number, since it is larger than the sum of its proper divisors (10312035789).

21041564211 is a wasteful number, since it uses less digits than its factorization.

21041564211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6520 (or 6514 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 21041564211 in words is "twenty-one billion, forty-one million, five hundred sixty-four thousand, two hundred eleven".