4226211721 has 4 divisors (see below), whose sum is σ = 4269781012. Its totient is φ = 4182642432.

The previous prime is 4226211701. The next prime is 4226211727. The reversal of 4226211721 is 1271126224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2284840000 + 1941371721 = 47800^2 + 44061^2 .

It is a cyclic number.

It is not a de Polignac number, because 4226211721 - 2⁷ = 4226211593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4226211721.

It is not an unprimeable number, because it can be changed into a prime (4226211727) 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, 21784500 + ... + 21784693.

It is an arithmetic number, because the mean of its divisors is an integer number (1067445253).

Almost surely, 2^4226211721 is an apocalyptic number.

It is an amenable number.

4226211721 is a deficient number, since it is larger than the sum of its proper divisors (43569291).

4226211721 is an equidigital number, since it uses as much as digits as its factorization.

4226211721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43569290.

The product of its digits is 2688, while the sum is 28.

The square root of 4226211721 is about 65009.3202625593. The cubic root of 4226211721 is about 1616.7780958705.

Adding to 4226211721 its reverse (1271126224), we get a palindrome (5497337945).

The spelling of 4226211721 in words is "four billion, two hundred twenty-six million, two hundred eleven thousand, seven hundred twenty-one".