21011055532 has 48 divisors (see below), whose sum is σ = 39049395840. Its totient is φ = 9864346752.

The previous prime is 21011055521. The next prime is 21011055539. The reversal of 21011055532 is 23555011012.

It is a junction number, because it is equal to n+sod(n) for n = 21011055497 and 21011055506.

It is not an unprimeable number, because it can be changed into a prime (21011055539) by changing a digit.

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, 4017103 + ... + 4022329.

It is an arithmetic number, because the mean of its divisors is an integer number (813529080).

Almost surely, 2^21011055532 is an apocalyptic number.

It is an amenable number.

21011055532 is a deficient number, since it is larger than the sum of its proper divisors (18038340308).

21011055532 is a wasteful number, since it uses less digits than its factorization.

21011055532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5710 (or 5708 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 21011055532 its reverse (23555011012), we get a palindrome (44566066544).

The spelling of 21011055532 in words is "twenty-one billion, eleven million, fifty-five thousand, five hundred thirty-two".