21264432060 has 48 divisors (see below), whose sum is σ = 61149616416. Its totient is φ = 5517257472.

The previous prime is 21264432017. The next prime is 21264432083. The reversal of 21264432060 is 6023446212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4787067 + ... + 4791506.

It is an arithmetic number, because the mean of its divisors is an integer number (1273950342).

Almost surely, 2^21264432060 is an apocalyptic number.

21264432060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21264432060 is an abundant number, since it is smaller than the sum of its proper divisors (39885184356).

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

21264432060 is a wasteful number, since it uses less digits than its factorization.

21264432060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9578622 (or 9578620 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 21264432060 its reverse (6023446212), we get a palindrome (27287878272).

The spelling of 21264432060 in words is "twenty-one billion, two hundred sixty-four million, four hundred thirty-two thousand, sixty".