21443163205 has 16 divisors (see below), whose sum is σ = 26775131904. Its totient is φ = 16472747200.

The previous prime is 21443163199. The next prime is 21443163223. The reversal of 21443163205 is 50236134412.

It is not a de Polignac number, because 21443163205 - 2⁵ = 21443163173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 848371 + ... + 873280.

It is an arithmetic number, because the mean of its divisors is an integer number (1673445744).

Almost surely, 2^21443163205 is an apocalyptic number.

It is an amenable number.

21443163205 is a deficient number, since it is larger than the sum of its proper divisors (5331968699).

21443163205 is a wasteful number, since it uses less digits than its factorization.

21443163205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721756.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21443163205 its reverse (50236134412), we get a palindrome (71679297617).

The spelling of 21443163205 in words is "twenty-one billion, four hundred forty-three million, one hundred sixty-three thousand, two hundred five".