122565221 has 4 divisors (see below), whose sum is σ = 122594700. Its totient is φ = 122535744.

The previous prime is 122565211. The next prime is 122565239.

122565221 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36168196 + 86397025 = 6014^2 + 9295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122565221 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 (122565211) 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, 7226 + ... + 17243.

It is an arithmetic number, because the mean of its divisors is an integer number (30648675).

Almost surely, 2^122565221 is an apocalyptic number.

It is an amenable number.

122565221 is a deficient number, since it is larger than the sum of its proper divisors (29479).

122565221 is an equidigital number, since it uses as much as digits as its factorization.

122565221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29478.

The product of its digits is 2400, while the sum is 26.

The square root of 122565221 is about 11070.9178029647. The cubic root of 122565221 is about 496.7323190443.

The spelling of 122565221 in words is "one hundred twenty-two million, five hundred sixty-five thousand, two hundred twenty-one".