4221315561 has 4 divisors (see below), whose sum is σ = 5628420752. Its totient is φ = 2814210372.

The previous prime is 4221315541. The next prime is 4221315563. The reversal of 4221315561 is 1655131224.

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 not a de Polignac number, because 4221315561 - 2²² = 4217121257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221315563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703552591 + ... + 703552596.

It is an arithmetic number, because the mean of its divisors is an integer number (1407105188).

Almost surely, 2^4221315561 is an apocalyptic number.

It is an amenable number.

4221315561 is a deficient number, since it is larger than the sum of its proper divisors (1407105191).

4221315561 is a wasteful number, since it uses less digits than its factorization.

4221315561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407105190.

The product of its digits is 7200, while the sum is 30.

The square root of 4221315561 is about 64971.6519799212. The cubic root of 4221315561 is about 1616.1534968451.

Adding to 4221315561 its reverse (1655131224), we get a palindrome (5876446785).

The spelling of 4221315561 in words is "four billion, two hundred twenty-one million, three hundred fifteen thousand, five hundred sixty-one".