2216520121 has 2 divisors, whose sum is σ = 2216520122. Its totient is φ = 2216520120.

The previous prime is 2216520101. The next prime is 2216520151. The reversal of 2216520121 is 1210256122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2066702521 + 149817600 = 45461^2 + 12240^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216520121 - 2⁹ = 2216519609 is a prime.

It is a super-2 number, since 2×2216520121² = 9825922893595709282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2216520092 and 2216520101.

It is not a weakly prime, because it can be changed into another prime (2216520101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108260060 + 1108260061.

It is an arithmetic number, because the mean of its divisors is an integer number (1108260061).

Almost surely, 2^2216520121 is an apocalyptic number.

It is an amenable number.

2216520121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216520121 is an equidigital number, since it uses as much as digits as its factorization.

2216520121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 2216520121 is about 47079.9333155857. The cubic root of 2216520121 is about 1303.8387757895.

Adding to 2216520121 its reverse (1210256122), we get a palindrome (3426776243).

The spelling of 2216520121 in words is "two billion, two hundred sixteen million, five hundred twenty thousand, one hundred twenty-one".