1211022213 has 4 divisors (see below), whose sum is σ = 1614696288. Its totient is φ = 807348140.

The previous prime is 1211022193. The next prime is 1211022229. The reversal of 1211022213 is 3122201121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211022213 - 2⁵ = 1211022181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211022192 and 1211022201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211022283) 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, 201837033 + ... + 201837038.

It is an arithmetic number, because the mean of its divisors is an integer number (403674072).

Almost surely, 2^1211022213 is an apocalyptic number.

It is an amenable number.

1211022213 is a deficient number, since it is larger than the sum of its proper divisors (403674075).

1211022213 is an equidigital number, since it uses as much as digits as its factorization.

1211022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403674074.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1211022213 is about 34799.7444387168. The cubic root of 1211022213 is about 1065.9022273623.

Adding to 1211022213 its reverse (3122201121), we get a palindrome (4333223334).

The spelling of 1211022213 in words is "one billion, two hundred eleven million, twenty-two thousand, two hundred thirteen".