21325015053 has 6 divisors (see below), whose sum is σ = 30802799534. Its totient is φ = 14216676696.

The previous prime is 21325015037. The next prime is 21325015057. The reversal of 21325015053 is 35051052312.

It is a happy number.

21325015053 is a `hidden beast` number, since 213 + 250 + 150 + 53 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16092952164 + 5232062889 = 126858^2 + 72333^2 .

It is not a de Polignac number, because 21325015053 - 2⁴ = 21325015037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325015057) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 1184723050 + ... + 1184723067.

Almost surely, 2^21325015053 is an apocalyptic number.

It is an amenable number.

21325015053 is a deficient number, since it is larger than the sum of its proper divisors (9477784481).

21325015053 is a wasteful number, since it uses less digits than its factorization.

21325015053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369446123 (or 2369446120 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

Adding to 21325015053 its reverse (35051052312), we get a palindrome (56376067365).

The spelling of 21325015053 in words is "twenty-one billion, three hundred twenty-five million, fifteen thousand, fifty-three".