2221335521 has 8 divisors (see below), whose sum is σ = 2244887400. Its totient is φ = 2197814400.

The previous prime is 2221335517. The next prime is 2221335527. The reversal of 2221335521 is 1255331222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1828503121 + 392832400 = 42761^2 + 19820^2 .

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 2221335521 - 2² = 2221335517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221335527) 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, 155675 + ... + 169343.

It is an arithmetic number, because the mean of its divisors is an integer number (280610925).

Almost surely, 2^2221335521 is an apocalyptic number.

It is an amenable number.

2221335521 is a deficient number, since it is larger than the sum of its proper divisors (23551879).

2221335521 is a wasteful number, since it uses less digits than its factorization.

2221335521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15379.

The product of its digits is 3600, while the sum is 26.

The square root of 2221335521 is about 47131.0462540351. The cubic root of 2221335521 is about 1304.7822914032.

Adding to 2221335521 its reverse (1255331222), we get a palindrome (3476666743).

The spelling of 2221335521 in words is "two billion, two hundred twenty-one million, three hundred thirty-five thousand, five hundred twenty-one".