1211102213 has 4 divisors (see below), whose sum is σ = 1217377548. Its totient is φ = 1204826880.

The previous prime is 1211102183. The next prime is 1211102257. The reversal of 1211102213 is 3122011121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 700025764 + 511076449 = 26458^2 + 22607^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211102213 - 2⁶ = 1211102149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211102273) 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, 3137378 + ... + 3137763.

It is an arithmetic number, because the mean of its divisors is an integer number (304344387).

Almost surely, 2^1211102213 is an apocalyptic number.

It is an amenable number.

1211102213 is a deficient number, since it is larger than the sum of its proper divisors (6275335).

1211102213 is an equidigital number, since it uses as much as digits as its factorization.

1211102213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275334.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1211102213 is about 34800.8938534630. The cubic root of 1211102213 is about 1065.9256979752.

Adding to 1211102213 its reverse (3122011121), we get a palindrome (4333113334).

The spelling of 1211102213 in words is "one billion, two hundred eleven million, one hundred two thousand, two hundred thirteen".