21159643941 has 6 divisors (see below), whose sum is σ = 30563930150. Its totient is φ = 14106429288.

The previous prime is 21159643919. The next prime is 21159643951. The reversal of 21159643941 is 14934695112.

21159643941 is a `hidden beast` number, since 2 + 11 + 596 + 4 + 3 + 9 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11875550625 + 9284093316 = 108975^2 + 96354^2 .

It is not a de Polignac number, because 21159643941 - 2⁶ = 21159643877 is a prime.

It is a super-2 number, since 2×21159643941² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21159643951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1175535766 + ... + 1175535783.

Almost surely, 2^21159643941 is an apocalyptic number.

It is an amenable number.

21159643941 is a deficient number, since it is larger than the sum of its proper divisors (9404286209).

21159643941 is a wasteful number, since it uses less digits than its factorization.

21159643941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351071555 (or 2351071552 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 21159643941 in words is "twenty-one billion, one hundred fifty-nine million, six hundred forty-three thousand, nine hundred forty-one".