2223221521 has 4 divisors (see below), whose sum is σ = 2340233200. Its totient is φ = 2106209844.

The previous prime is 2223221503. The next prime is 2223221527. The reversal of 2223221521 is 1251223222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2223221521 - 2¹⁹ = 2222697233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2223221492 and 2223221501.

It is not an unprimeable number, because it can be changed into a prime (2223221527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58505811 + ... + 58505848.

It is an arithmetic number, because the mean of its divisors is an integer number (585058300).

Almost surely, 2^2223221521 is an apocalyptic number.

It is an amenable number.

2223221521 is a deficient number, since it is larger than the sum of its proper divisors (117011679).

2223221521 is a wasteful number, since it uses less digits than its factorization.

2223221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117011678.

The product of its digits is 960, while the sum is 22.

The square root of 2223221521 is about 47151.0500519342. The cubic root of 2223221521 is about 1305.1514571990.

Adding to 2223221521 its reverse (1251223222), we get a palindrome (3474444743).

The spelling of 2223221521 in words is "two billion, two hundred twenty-three million, two hundred twenty-one thousand, five hundred twenty-one".