2202121521 has 12 divisors (see below), whose sum is σ = 3258424260. Its totient is φ = 1432273920.

The previous prime is 2202121507. The next prime is 2202121543. The reversal of 2202121521 is 1251212022.

2202121521 is a `hidden beast` number, since 2 + 20 + 2 + 121 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 827195121 + 1374926400 = 28761^2 + 37080^2 .

It is not a de Polignac number, because 2202121521 - 2⁶ = 2202121457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2202121494 and 2202121503.

It is not an unprimeable number, because it can be changed into a prime (2202121501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2983536 + ... + 2984273.

It is an arithmetic number, because the mean of its divisors is an integer number (271535355).

Almost surely, 2^2202121521 is an apocalyptic number.

It is an amenable number.

2202121521 is a deficient number, since it is larger than the sum of its proper divisors (1056302739).

2202121521 is a wasteful number, since it uses less digits than its factorization.

2202121521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5967856 (or 5967853 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2202121521 is about 46926.7676385238. The cubic root of 2202121521 is about 1301.0093780040.

Adding to 2202121521 its reverse (1251212022), we get a palindrome (3453333543).

The spelling of 2202121521 in words is "two billion, two hundred two million, one hundred twenty-one thousand, five hundred twenty-one".