21541850017611 has 32 divisors (see below), whose sum is σ = 35813651102208. Its totient is φ = 11189376906240.

The previous prime is 21541850017601. The next prime is 21541850017711. The reversal of 21541850017611 is 11671005814512.

It is not a de Polignac number, because 21541850017611 - 2¹¹ = 21541850015563 is a prime.

It is a super-4 number, since 4×21541850017611⁴ (a number of 54 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21541850017601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2806440 + ... + 7138613.

It is an arithmetic number, because the mean of its divisors is an integer number (1119176596944).

Almost surely, 2^{21541850017611} is an apocalyptic number.

21541850017611 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21541850017611 is a deficient number, since it is larger than the sum of its proper divisors (14271801084597).

21541850017611 is a wasteful number, since it uses less digits than its factorization.

21541850017611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9954451.

The product of its (nonzero) digits is 67200, while the sum is 42.

The spelling of 21541850017611 in words is "twenty-one trillion, five hundred forty-one billion, eight hundred fifty million, seventeen thousand, six hundred eleven".