21134321085 has 32 divisors (see below), whose sum is σ = 33938731008. Its totient is φ = 11230433280.

The previous prime is 21134321071. The next prime is 21134321093. The reversal of 21134321085 is 58012343112.

It is not a de Polignac number, because 21134321085 - 2¹³ = 21134312893 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, 10000989 + ... + 10003101.

It is an arithmetic number, because the mean of its divisors is an integer number (1060585344).

Almost surely, 2^21134321085 is an apocalyptic number.

It is an amenable number.

21134321085 is a deficient number, since it is larger than the sum of its proper divisors (12804409923).

21134321085 is a wasteful number, since it uses less digits than its factorization.

21134321085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245.

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 21134321085 its reverse (58012343112), we get a palindrome (79146664197).

The spelling of 21134321085 in words is "twenty-one billion, one hundred thirty-four million, three hundred twenty-one thousand, eighty-five".