21131034205 has 8 divisors (see below), whose sum is σ = 26691832800. Its totient is φ = 16015099536.

The previous prime is 21131034193. The next prime is 21131034229. The reversal of 21131034205 is 50243013112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21131034205 - 2⁵ = 21131034173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111215875 + ... + 111216064.

It is an arithmetic number, because the mean of its divisors is an integer number (3336479100).

Almost surely, 2^21131034205 is an apocalyptic number.

It is an amenable number.

21131034205 is a deficient number, since it is larger than the sum of its proper divisors (5560798595).

21131034205 is a wasteful number, since it uses less digits than its factorization.

21131034205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222431963.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21131034205 its reverse (50243013112), we get a palindrome (71374047317).

The spelling of 21131034205 in words is "twenty-one billion, one hundred thirty-one million, thirty-four thousand, two hundred five".