21124221282 has 32 divisors (see below), whose sum is σ = 46948089600. Its totient is φ = 7040600784.

The previous prime is 21124221271. The next prime is 21124221331. The reversal of 21124221282 is 28212242112.

21124221282 is a `hidden beast` number, since 2 + 112 + 422 + 128 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 625444 + ... + 658352.

It is an arithmetic number, because the mean of its divisors is an integer number (1467127800).

Almost surely, 2^21124221282 is an apocalyptic number.

21124221282 is an abundant number, since it is smaller than the sum of its proper divisors (25823868318).

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

21124221282 is a wasteful number, since it uses less digits than its factorization.

21124221282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44807 (or 44801 counting only the distinct ones).

The product of its digits is 2048, while the sum is 27.

Adding to 21124221282 its reverse (28212242112), we get a palindrome (49336463394).

The spelling of 21124221282 in words is "twenty-one billion, one hundred twenty-four million, two hundred twenty-one thousand, two hundred eighty-two".