221121017 has 8 divisors (see below), whose sum is σ = 240489480. Its totient is φ = 202089600.

The previous prime is 221121013. The next prime is 221121053. The reversal of 221121017 is 710121122.

It can be written as a sum of positive squares in 4 ways, for example, as 30791401 + 190329616 = 5549^2 + 13796^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221121017 - 2² = 221121013 is a prime.

It is a super-2 number, since 2×221121017² = 97789008318228578, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221120986 and 221121004.

It is not an unprimeable number, because it can be changed into a prime (221121013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82892 + ... + 85517.

It is an arithmetic number, because the mean of its divisors is an integer number (30061185).

Almost surely, 2^221121017 is an apocalyptic number.

It is an amenable number.

221121017 is a deficient number, since it is larger than the sum of its proper divisors (19368463).

221121017 is a wasteful number, since it uses less digits than its factorization.

221121017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168523.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 221121017 is about 14870.1384324424. The cubic root of 221121017 is about 604.7046957169.

Adding to 221121017 its reverse (710121122), we get a palindrome (931242139).

The spelling of 221121017 in words is "two hundred twenty-one million, one hundred twenty-one thousand, seventeen".