21151443443011 has 32 divisors (see below), whose sum is σ = 24538887360000. Its totient is φ = 17857140187392.

The previous prime is 21151443442979. The next prime is 21151443443021. The reversal of 21151443443011 is 11034434415112.

It is a cyclic number.

It is not a de Polignac number, because 21151443443011 - 2⁵ = 21151443442979 is a prime.

It is a super-2 number, since 2×21151443443011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21151443443021) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 190671640 + ... + 190782538.

It is an arithmetic number, because the mean of its divisors is an integer number (766840230000).

Almost surely, 2^{21151443443011} is an apocalyptic number.

21151443443011 is a deficient number, since it is larger than the sum of its proper divisors (3387443916989).

21151443443011 is a wasteful number, since it uses less digits than its factorization.

21151443443011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112171.

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 21151443443011 its reverse (11034434415112), we get a palindrome (32185877858123).

The spelling of 21151443443011 in words is "twenty-one trillion, one hundred fifty-one billion, four hundred forty-three million, four hundred forty-three thousand, eleven".