21011155484 has 24 divisors (see below), whose sum is σ = 40180589568. Its totient is φ = 9534243440.

The previous prime is 21011155483. The next prime is 21011155549. The reversal of 21011155484 is 48455111012.

It is a self number, because there is not a number n which added to its sum of digits gives 21011155484.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011155481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380924 + ... + 432579.

It is an arithmetic number, because the mean of its divisors is an integer number (1674191232).

Almost surely, 2^21011155484 is an apocalyptic number.

It is an amenable number.

21011155484 is a deficient number, since it is larger than the sum of its proper divisors (19169434084).

21011155484 is a wasteful number, since it uses less digits than its factorization.

21011155484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814105 (or 814103 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

Adding to 21011155484 its reverse (48455111012), we get a palindrome (69466266496).

The spelling of 21011155484 in words is "twenty-one billion, eleven million, one hundred fifty-five thousand, four hundred eighty-four".