122998205521 has 3 divisors (see below), whose sum is σ = 122998556233. Its totient is φ = 122997854810.

The previous prime is 122998205513. The next prime is 122998205531. The reversal of 122998205521 is 125502899221.

The square root of 122998205521 is 350711.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 125502899221 = 7 ⋅17928985603.

It is not a de Polignac number, because 122998205521 - 2³ = 122998205513 is a prime.

It is a super-2 number, since 2×122998205521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122998205531) 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 2 ways as a sum of consecutive naturals, for example, 175356 + ... + 526066.

Almost surely, 2^122998205521 is an apocalyptic number.

122998205521 is the 350711-st square number.

122998205521 is the 175356-th centered octagonal number.

It is an amenable number.

122998205521 is a deficient number, since it is larger than the sum of its proper divisors (350712).

122998205521 is an frugal number, since it uses more digits than its factorization.

122998205521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701422 (or 350711 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 122998205521 in words is "one hundred twenty-two billion, nine hundred ninety-eight million, two hundred five thousand, five hundred twenty-one".