22217749147721 has 2 divisors, whose sum is σ = 22217749147722. Its totient is φ = 22217749147720.

The previous prime is 22217749147709. The next prime is 22217749147771. The reversal of 22217749147721 is 12774194771222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21551181405625 + 666567742096 = 4642325^2 + 816436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22217749147721 is a prime.

It is not a weakly prime, because it can be changed into another prime (22217749147771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11108874573860 + 11108874573861.

It is an arithmetic number, because the mean of its divisors is an integer number (11108874573861).

Almost surely, 2^{22217749147721} is an apocalyptic number.

It is an amenable number.

22217749147721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22217749147721 is an equidigital number, since it uses as much as digits as its factorization.

22217749147721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5531904, while the sum is 56.

The spelling of 22217749147721 in words is "twenty-two trillion, two hundred seventeen billion, seven hundred forty-nine million, one hundred forty-seven thousand, seven hundred twenty-one".