122566221 has 6 divisors (see below), whose sum is σ = 177040110. Its totient is φ = 81710808.

The previous prime is 122566181. The next prime is 122566229. The reversal of 122566221 is 122665221.

122566221 is a `hidden beast` number, since 12 + 25 + 6 + 622 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 83064996 + 39501225 = 9114^2 + 6285^2 .

It is a de Polignac number, because none of the positive numbers 2^k-122566221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122566229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6809226 + ... + 6809243.

It is an arithmetic number, because the mean of its divisors is an integer number (29506685).

Almost surely, 2^122566221 is an apocalyptic number.

It is an amenable number.

122566221 is a deficient number, since it is larger than the sum of its proper divisors (54473889).

122566221 is a wasteful number, since it uses less digits than its factorization.

122566221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13618475 (or 13618472 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 122566221 is about 11070.9629662464. The cubic root of 122566221 is about 496.7336699739.

The spelling of 122566221 in words is "one hundred twenty-two million, five hundred sixty-six thousand, two hundred twenty-one".