521215225453 has 16 divisors (see below), whose sum is σ = 592185142080. Its totient is φ = 454770561024.

The previous prime is 521215225429. The next prime is 521215225457. The reversal of 521215225453 is 354522512125.

It is a de Polignac number, because none of the positive numbers 2^k-521215225453 is a prime.

It is a super-2 number, since 2×521215225453² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521215225457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2272276 + ... + 2491117.

It is an arithmetic number, because the mean of its divisors is an integer number (37011571380).

Almost surely, 2^521215225453 is an apocalyptic number.

It is an amenable number.

521215225453 is a deficient number, since it is larger than the sum of its proper divisors (70969916627).

521215225453 is a wasteful number, since it uses less digits than its factorization.

521215225453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4763868.

The product of its digits is 120000, while the sum is 37.

Adding to 521215225453 its reverse (354522512125), we get a palindrome (875737737578).

The spelling of 521215225453 in words is "five hundred twenty-one billion, two hundred fifteen million, two hundred twenty-five thousand, four hundred fifty-three".