21063130536 has 128 divisors (see below), whose sum is σ = 60764774400. Its totient is φ = 5959799040.

The previous prime is 21063130477. The next prime is 21063130541. The reversal of 21063130536 is 63503136012.

It is a happy 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, 18992350 + ... + 18993458.

It is an arithmetic number, because the mean of its divisors is an integer number (474724800).

Almost surely, 2^21063130536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21063130536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30382387200).

21063130536 is an abundant number, since it is smaller than the sum of its proper divisors (39701643864).

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

21063130536 is a wasteful number, since it uses less digits than its factorization.

21063130536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

Adding to 21063130536 its reverse (63503136012), we get a palindrome (84566266548).

The spelling of 21063130536 in words is "twenty-one billion, sixty-three million, one hundred thirty thousand, five hundred thirty-six".