21231334605 has 32 divisors (see below), whose sum is σ = 36610560000. Its totient is φ = 10444538880.

The previous prime is 21231334603. The next prime is 21231334639. The reversal of 21231334605 is 50643313212.

It is not a de Polignac number, because 21231334605 - 2¹ = 21231334603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231334603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225396 + ... + 305394.

It is an arithmetic number, because the mean of its divisors is an integer number (1144080000).

Almost surely, 2^21231334605 is an apocalyptic number.

It is an amenable number.

21231334605 is a deficient number, since it is larger than the sum of its proper divisors (15379225395).

21231334605 is a wasteful number, since it uses less digits than its factorization.

21231334605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81381.

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 21231334605 its reverse (50643313212), we get a palindrome (71874647817).

The spelling of 21231334605 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-four thousand, six hundred five".