1211002213 has 8 divisors (see below), whose sum is σ = 1254699000. Its totient is φ = 1167434688.

The previous prime is 1211002181. The next prime is 1211002291. The reversal of 1211002213 is 3122001121.

It can be written as a sum of positive squares in 4 ways, for example, as 163379524 + 1047622689 = 12782^2 + 32367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211002213 - 2⁵ = 1211002181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211002193 and 1211002202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211002813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13038 + ... + 50911.

It is an arithmetic number, because the mean of its divisors is an integer number (156837375).

Almost surely, 2^1211002213 is an apocalyptic number.

It is an amenable number.

1211002213 is a deficient number, since it is larger than the sum of its proper divisors (43696787).

1211002213 is an equidigital number, since it uses as much as digits as its factorization.

1211002213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64631.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1211002213 is about 34799.4570790982. The cubic root of 1211002213 is about 1065.8963595476.

Adding to 1211002213 its reverse (3122001121), we get a palindrome (4333003334).

The spelling of 1211002213 in words is "one billion, two hundred eleven million, two thousand, two hundred thirteen".