122522821 has 4 divisors (see below), whose sum is σ = 122568012. Its totient is φ = 122477632.

The previous prime is 122522789. The next prime is 122522837. The reversal of 122522821 is 128225221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128225221 = 5639 ⋅22739.

It can be written as a sum of positive squares in 2 ways, for example, as 21520321 + 101002500 = 4639^2 + 10050^2 .

It is a cyclic number.

It is not a de Polignac number, because 122522821 - 2⁵ = 122522789 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 (122522891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18250 + ... + 24043.

It is an arithmetic number, because the mean of its divisors is an integer number (30642003).

Almost surely, 2^122522821 is an apocalyptic number.

It is an amenable number.

122522821 is a deficient number, since it is larger than the sum of its proper divisors (45191).

122522821 is an equidigital number, since it uses as much as digits as its factorization.

122522821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45190.

The product of its digits is 1280, while the sum is 25.

The square root of 122522821 is about 11069.0027102716. The cubic root of 122522821 is about 496.6750328656.

The spelling of 122522821 in words is "one hundred twenty-two million, five hundred twenty-two thousand, eight hundred twenty-one".