2221231555 has 8 divisors (see below), whose sum is σ = 2781368352. Its totient is φ = 1699724928.

The previous prime is 2221231549. The next prime is 2221231583. The reversal of 2221231555 is 5551321222.

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 2221231555 - 2¹⁵ = 2221198787 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9657414 + ... + 9657643.

It is an arithmetic number, because the mean of its divisors is an integer number (347671044).

Almost surely, 2^2221231555 is an apocalyptic number.

2221231555 is a deficient number, since it is larger than the sum of its proper divisors (560136797).

2221231555 is a wasteful number, since it uses less digits than its factorization.

2221231555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19315085.

The product of its digits is 6000, while the sum is 28.

The square root of 2221231555 is about 47129.9432951070. The cubic root of 2221231555 is about 1304.7619350139.

Adding to 2221231555 its reverse (5551321222), we get a palindrome (7772552777).

The spelling of 2221231555 in words is "two billion, two hundred twenty-one million, two hundred thirty-one thousand, five hundred fifty-five".