2221071621 has 16 divisors (see below), whose sum is σ = 3043732224. Its totient is φ = 1439964864.

The previous prime is 2221071581. The next prime is 2221071667. The reversal of 2221071621 is 1261701222.

It is not a de Polignac number, because 2221071621 - 2¹⁰ = 2221070597 is a prime.

It is a super-2 number, since 2×2221071621² = 9866318291223135282, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221071591 and 2221071600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221071121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28030 + ... + 72303.

It is an arithmetic number, because the mean of its divisors is an integer number (190233264).

Almost surely, 2^2221071621 is an apocalyptic number.

It is an amenable number.

2221071621 is a deficient number, since it is larger than the sum of its proper divisors (822660603).

2221071621 is a wasteful number, since it uses less digits than its factorization.

2221071621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100540.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 2221071621 is about 47128.2465300800. The cubic root of 2221071621 is about 1304.7306189326.

Adding to 2221071621 its reverse (1261701222), we get a palindrome (3482772843).

The spelling of 2221071621 in words is "two billion, two hundred twenty-one million, seventy-one thousand, six hundred twenty-one".