122721328 has 10 divisors (see below), whose sum is σ = 237772604. Its totient is φ = 61360656.

The previous prime is 122721311. The next prime is 122721367. The reversal of 122721328 is 823127221.

It is a junction number, because it is equal to n+sod(n) for n = 122721296 and 122721305.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3835026 + ... + 3835057.

Almost surely, 2^122721328 is an apocalyptic number.

It is an amenable number.

122721328 is a deficient number, since it is larger than the sum of its proper divisors (115051276).

122721328 is an equidigital number, since it uses as much as digits as its factorization.

122721328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670091 (or 7670085 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 122721328 is about 11077.9658782648. The cubic root of 122721328 is about 496.9431197193.

Adding to 122721328 its reverse (823127221), we get a palindrome (945848549).

The spelling of 122721328 in words is "one hundred twenty-two million, seven hundred twenty-one thousand, three hundred twenty-eight".