2221161724 has 24 divisors (see below), whose sum is σ = 4130260848. Its totient is φ = 1041550080.

The previous prime is 2221161703. The next prime is 2221161737. The reversal of 2221161724 is 4271611222.

It is a junction number, because it is equal to n+sod(n) for n = 2221161692 and 2221161701.

It is a congruent 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, 38467 + ... + 76954.

It is an arithmetic number, because the mean of its divisors is an integer number (172094202).

Almost surely, 2^2221161724 is an apocalyptic number.

It is an amenable number.

2221161724 is a deficient number, since it is larger than the sum of its proper divisors (1909099124).

2221161724 is a wasteful number, since it uses less digits than its factorization.

2221161724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115725 (or 115723 counting only the distinct ones).

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

The square root of 2221161724 is about 47129.2024545292. The cubic root of 2221161724 is about 1304.7482618506.

Adding to 2221161724 its reverse (4271611222), we get a palindrome (6492772946).

The spelling of 2221161724 in words is "two billion, two hundred twenty-one million, one hundred sixty-one thousand, seven hundred twenty-four".