21143808011 has 2 divisors, whose sum is σ = 21143808012. Its totient is φ = 21143808010.

The previous prime is 21143807989. The next prime is 21143808047. The reversal of 21143808011 is 11080834112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21143808011 - 2⁶ = 21143807947 is a prime.

It is a super-2 number, since 2×21143808011² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21143808061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571904005 + 10571904006.

It is an arithmetic number, because the mean of its divisors is an integer number (10571904006).

Almost surely, 2^21143808011 is an apocalyptic number.

21143808011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143808011 is an equidigital number, since it uses as much as digits as its factorization.

21143808011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 29.

The spelling of 21143808011 in words is "twenty-one billion, one hundred forty-three million, eight hundred eight thousand, eleven".