122551221 has 16 divisors (see below), whose sum is σ = 176670144. Its totient is φ = 75116544.

The previous prime is 122551133. The next prime is 122551223. The reversal of 122551221 is 122155221.

It is not a de Polignac number, because 122551221 - 2⁹ = 122550709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122551223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3910 + ... + 16136.

It is an arithmetic number, because the mean of its divisors is an integer number (11041884).

Almost surely, 2^122551221 is an apocalyptic number.

It is an amenable number.

122551221 is a deficient number, since it is larger than the sum of its proper divisors (54118923).

122551221 is a wasteful number, since it uses less digits than its factorization.

122551221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12500.

The product of its digits is 400, while the sum is 21.

The square root of 122551221 is about 11070.2854976735. The cubic root of 122551221 is about 496.7134052578.

The spelling of 122551221 in words is "one hundred twenty-two million, five hundred fifty-one thousand, two hundred twenty-one".