220123121 has 2 divisors, whose sum is σ = 220123122. Its totient is φ = 220123120.

The previous prime is 220123109. The next prime is 220123129. The reversal of 220123121 is 121321022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133726096 + 86397025 = 11564^2 + 9295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220123121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220123096 and 220123105.

It is not a weakly prime, because it can be changed into another prime (220123129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110061560 + 110061561.

It is an arithmetic number, because the mean of its divisors is an integer number (110061561).

Almost surely, 2^220123121 is an apocalyptic number.

It is an amenable number.

220123121 is a deficient number, since it is larger than the sum of its proper divisors (1).

220123121 is an equidigital number, since it uses as much as digits as its factorization.

220123121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 220123121 is about 14836.5468017325. The cubic root of 220123121 is about 603.7936675533.

Adding to 220123121 its reverse (121321022), we get a palindrome (341444143).

The spelling of 220123121 in words is "two hundred twenty million, one hundred twenty-three thousand, one hundred twenty-one".