21443963011 has 2 divisors, whose sum is σ = 21443963012. Its totient is φ = 21443963010.

The previous prime is 21443962999. The next prime is 21443963069. The reversal of 21443963011 is 11036934412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21443963011 - 2¹⁵ = 21443930243 is a prime.

It is a super-2 number, since 2×21443963011² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21443963111) 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 as a sum of consecutive naturals, namely, 10721981505 + 10721981506.

It is an arithmetic number, because the mean of its divisors is an integer number (10721981506).

Almost surely, 2^21443963011 is an apocalyptic number.

21443963011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443963011 is an equidigital number, since it uses as much as digits as its factorization.

21443963011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 21443963011 in words is "twenty-one billion, four hundred forty-three million, nine hundred sixty-three thousand, eleven".