521223422122522 has 12 divisors (see below), whose sum is σ = 909481685540490. Its totient is φ = 223381466623896.

The previous prime is 521223422122477. The next prime is 521223422122549. The reversal of 521223422122522 is 225221224322125.

It can be written as a sum of positive squares in only one way, i.e., 506791089504441 + 14432332618081 = 22512021^2 + 3798991^2 .

It is a super-2 number, since 2×521223422122522² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2659303173997 + ... + 2659303174192.

Almost surely, 2^{521223422122522} is an apocalyptic number.

521223422122522 is a deficient number, since it is larger than the sum of its proper divisors (388258263417968).

521223422122522 is a wasteful number, since it uses less digits than its factorization.

521223422122522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318606348205 (or 5318606348198 counting only the distinct ones).

The product of its digits is 153600, while the sum is 37.

Adding to 521223422122522 its reverse (225221224322125), we get a palindrome (746444646444647).

The spelling of 521223422122522 in words is "five hundred twenty-one trillion, two hundred twenty-three billion, four hundred twenty-two million, one hundred twenty-two thousand, five hundred twenty-two".