21433521205 has 32 divisors (see below), whose sum is σ = 27613232640. Its totient is φ = 15913497600.

The previous prime is 21433521191. The next prime is 21433521223. The reversal of 21433521205 is 50212533412.

It is not a de Polignac number, because 21433521205 - 2⁷ = 21433521077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7055947 + ... + 7058983.

It is an arithmetic number, because the mean of its divisors is an integer number (862913520).

Almost surely, 2^21433521205 is an apocalyptic number.

It is an amenable number.

21433521205 is a deficient number, since it is larger than the sum of its proper divisors (6179711435).

21433521205 is a wasteful number, since it uses less digits than its factorization.

21433521205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4189.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21433521205 in words is "twenty-one billion, four hundred thirty-three million, five hundred twenty-one thousand, two hundred five".