21143808001 has 4 divisors (see below), whose sum is σ = 21145086400. Its totient is φ = 21142529604.

The previous prime is 21143807989. The next prime is 21143808011. The reversal of 21143808001 is 10080834112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21143808001 - 2²⁵ = 21110253569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21143808011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614061 + ... + 647578.

It is an arithmetic number, because the mean of its divisors is an integer number (5286271600).

Almost surely, 2^21143808001 is an apocalyptic number.

It is an amenable number.

21143808001 is a deficient number, since it is larger than the sum of its proper divisors (1278399).

21143808001 is a wasteful number, since it uses less digits than its factorization.

21143808001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278398.

The product of its (nonzero) digits is 1536, while the sum is 28.

The spelling of 21143808001 in words is "twenty-one billion, one hundred forty-three million, eight hundred eight thousand, one".