122721656 has 16 divisors (see below), whose sum is σ = 235455000. Its totient is φ = 59933664.

The previous prime is 122721619. The next prime is 122721671. The reversal of 122721656 is 656127221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178031 + ... + 178718.

Almost surely, 2^122721656 is an apocalyptic number.

It is an amenable number.

122721656 is a deficient number, since it is larger than the sum of its proper divisors (112733344).

122721656 is a wasteful number, since it uses less digits than its factorization.

122721656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356798 (or 356794 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 122721656 is about 11077.9806824168. The cubic root of 122721656 is about 496.9435624492.

Adding to 122721656 its reverse (656127221), we get a palindrome (778848877).

The spelling of 122721656 in words is "one hundred twenty-two million, seven hundred twenty-one thousand, six hundred fifty-six".