21124130264 has 8 divisors (see below), whose sum is σ = 39607744260. Its totient is φ = 10562065128.

The previous prime is 21124130239. The next prime is 21124130299. The reversal of 21124130264 is 46203142112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 1320258134 + ... + 1320258149.

Almost surely, 2^21124130264 is an apocalyptic number.

It is an amenable number.

21124130264 is a deficient number, since it is larger than the sum of its proper divisors (18483613996).

21124130264 is a wasteful number, since it uses less digits than its factorization.

21124130264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640516289 (or 2640516285 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21124130264 its reverse (46203142112), we get a palindrome (67327272376).

The spelling of 21124130264 in words is "twenty-one billion, one hundred twenty-four million, one hundred thirty thousand, two hundred sixty-four".