1000211221 has 4 divisors (see below), whose sum is σ = 1000281100. Its totient is φ = 1000141344.

The previous prime is 1000211209. The next prime is 1000211227. The reversal of 1000211221 is 1221120001.

1000211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 165636900 + 834574321 = 12870^2 + 28889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000211221 - 2⁹ = 1000210709 is a prime.

It is a super-2 number, since 2×1000211221² = 2000844973228621682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000211198 and 1000211207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000211227) 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, 4806 + ... + 44983.

It is an arithmetic number, because the mean of its divisors is an integer number (250070275).

Almost surely, 2^1000211221 is an apocalyptic number.

It is an amenable number.

1000211221 is a deficient number, since it is larger than the sum of its proper divisors (69879).

1000211221 is an equidigital number, since it uses as much as digits as its factorization.

1000211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69878.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1000211221 is about 31626.1161225972. The cubic root of 1000211221 is about 1000.0704020434.

Adding to 1000211221 its reverse (1221120001), we get a palindrome (2221331222).

The spelling of 1000211221 in words is "one billion, two hundred eleven thousand, two hundred twenty-one".