220217121 has 6 divisors (see below), whose sum is σ = 318091410. Its totient is φ = 146811408.

The previous prime is 220217117. The next prime is 220217131. The reversal of 220217121 is 121712022.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 133056225 + 87160896 = 11535^2 + 9336^2 .

It is not a de Polignac number, because 220217121 - 2² = 220217117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220217094 and 220217103.

It is not an unprimeable number, because it can be changed into a prime (220217131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12234276 + ... + 12234293.

It is an arithmetic number, because the mean of its divisors is an integer number (53015235).

Almost surely, 2^220217121 is an apocalyptic number.

It is an amenable number.

220217121 is a deficient number, since it is larger than the sum of its proper divisors (97874289).

220217121 is a wasteful number, since it uses less digits than its factorization.

220217121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24468575 (or 24468572 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 220217121 is about 14839.7143166572. The cubic root of 220217121 is about 603.8796020785.

Adding to 220217121 its reverse (121712022), we get a palindrome (341929143).

The spelling of 220217121 in words is "two hundred twenty million, two hundred seventeen thousand, one hundred twenty-one".