220520121 has 16 divisors (see below), whose sum is σ = 300395520. Its totient is φ = 143844480.

The previous prime is 220520117. The next prime is 220520123. The reversal of 220520121 is 121025022.

It is not a de Polignac number, because 220520121 - 2² = 220520117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220520121.

It is not an unprimeable number, because it can be changed into a prime (220520123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63336 + ... + 66726.

It is an arithmetic number, because the mean of its divisors is an integer number (18774720).

Almost surely, 2^220520121 is an apocalyptic number.

It is an amenable number.

220520121 is a deficient number, since it is larger than the sum of its proper divisors (79875399).

220520121 is a wasteful number, since it uses less digits than its factorization.

220520121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 220520121 is about 14849.9198987739. The cubic root of 220520121 is about 604.1564374476.

Adding to 220520121 its reverse (121025022), we get a palindrome (341545143).

The spelling of 220520121 in words is "two hundred twenty million, five hundred twenty thousand, one hundred twenty-one".