221512550053 has 4 divisors (see below), whose sum is σ = 221618691360. Its totient is φ = 221406408748.

The previous prime is 221512550047. The next prime is 221512550087. The reversal of 221512550053 is 350055215122.

221512550053 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221512550053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221512549997 and 221512550024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221512550033) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 53067523 + ... + 53071696.

It is an arithmetic number, because the mean of its divisors is an integer number (55404672840).

Almost surely, 2^221512550053 is an apocalyptic number.

It is an amenable number.

221512550053 is a deficient number, since it is larger than the sum of its proper divisors (106141307).

221512550053 is a wasteful number, since it uses less digits than its factorization.

221512550053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106141306.

The product of its (nonzero) digits is 15000, while the sum is 31.

Adding to 221512550053 its reverse (350055215122), we get a palindrome (571567765175).

The spelling of 221512550053 in words is "two hundred twenty-one billion, five hundred twelve million, five hundred fifty thousand, fifty-three".