21052200505 has 24 divisors (see below), whose sum is σ = 30103927560. Its totient is φ = 14083695360.

The previous prime is 21052200439. The next prime is 21052200553. The reversal of 21052200505 is 50500225012.

It can be written as a sum of positive squares in 4 ways, for example, as 2274431481 + 18777769024 = 47691^2 + 137032^2 .

It is not a de Polignac number, because 21052200505 - 2¹⁷ = 21052069433 is a prime.

It is a super-2 number, since 2×21052200505² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1037850 + ... + 1057939.

It is an arithmetic number, because the mean of its divisors is an integer number (1254330315).

Almost surely, 2^21052200505 is an apocalyptic number.

It is an amenable number.

21052200505 is a deficient number, since it is larger than the sum of its proper divisors (9051727055).

21052200505 is a wasteful number, since it uses less digits than its factorization.

21052200505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095849 (or 2095842 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

Adding to 21052200505 its reverse (50500225012), we get a palindrome (71552425517).

The spelling of 21052200505 in words is "twenty-one billion, fifty-two million, two hundred thousand, five hundred five".