21306136160 has 24 divisors (see below), whose sum is σ = 50335747056. Its totient is φ = 8522454400.

The previous prime is 21306136133. The next prime is 21306136169. The reversal of 21306136160 is 6163160312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21306136169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66581516 + ... + 66581835.

It is an arithmetic number, because the mean of its divisors is an integer number (2097322794).

Almost surely, 2^21306136160 is an apocalyptic number.

21306136160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21306136160 is an abundant number, since it is smaller than the sum of its proper divisors (29029610896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21306136160 is a wasteful number, since it uses less digits than its factorization.

21306136160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133163366 (or 133163358 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

Adding to 21306136160 its reverse (6163160312), we get a palindrome (27469296472).

The spelling of 21306136160 in words is "twenty-one billion, three hundred six million, one hundred thirty-six thousand, one hundred sixty".