21134332520 has 64 divisors (see below), whose sum is σ = 54359786880. Its totient is φ = 7244142336.

The previous prime is 21134332519. The next prime is 21134332547. The reversal of 21134332520 is 2523343112.

It is a happy number.

It is a super-2 number, since 2×21134332520² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21134332520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1414127 + ... + 1428993.

It is an arithmetic number, because the mean of its divisors is an integer number (849371670).

Almost surely, 2^21134332520 is an apocalyptic number.

21134332520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21134332520 is an abundant number, since it is smaller than the sum of its proper divisors (33225454360).

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

21134332520 is a wasteful number, since it uses less digits than its factorization.

21134332520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19962 (or 19958 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21134332520 its reverse (2523343112), we get a palindrome (23657675632).

The spelling of 21134332520 in words is "twenty-one billion, one hundred thirty-four million, three hundred thirty-two thousand, five hundred twenty".