21043025522505 has 48 divisors (see below), whose sum is σ = 41698771994880. Its totient is φ = 9616544083584.

The previous prime is 21043025522479. The next prime is 21043025522531. The reversal of 21043025522505 is 50522552034012.

21043025522505 is a `hidden beast` number, since 2 + 10 + 43 + 0 + 2 + 552 + 2 + 50 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (21043025522479) and next prime (21043025522531).

It is not a de Polignac number, because 21043025522505 - 2⁷ = 21043025522377 is a prime.

It is a super-2 number, since 2×21043025522505² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21043025522505.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9878322 + ... + 11818091.

It is an arithmetic number, because the mean of its divisors is an integer number (868724416560).

Almost surely, 2^{21043025522505} is an apocalyptic number.

It is an amenable number.

21043025522505 is a deficient number, since it is larger than the sum of its proper divisors (20655746472375).

21043025522505 is a wasteful number, since it uses less digits than its factorization.

21043025522505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21699510 (or 21699507 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

Adding to 21043025522505 its reverse (50522552034012), we get a palindrome (71565577556517).

The spelling of 21043025522505 in words is "twenty-one trillion, forty-three billion, twenty-five million, five hundred twenty-two thousand, five hundred five".