1211043213 has 6 divisors (see below), whose sum is σ = 1749284654. Its totient is φ = 807362136.

The previous prime is 1211043193. The next prime is 1211043217. The reversal of 1211043213 is 3123401121.

It can be written as a sum of positive squares in only one way, i.e., 898920324 + 312122889 = 29982^2 + 17667^2 .

It is not a de Polignac number, because 1211043213 - 2⁵ = 1211043181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211043217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67280170 + ... + 67280187.

Almost surely, 2^1211043213 is an apocalyptic number.

It is an amenable number.

1211043213 is a deficient number, since it is larger than the sum of its proper divisors (538241441).

1211043213 is a wasteful number, since it uses less digits than its factorization.

1211043213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134560363 (or 134560360 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1211043213 is about 34800.0461637625. The cubic root of 1211043213 is about 1065.9083884983.

Adding to 1211043213 its reverse (3123401121), we get a palindrome (4334444334).

The spelling of 1211043213 in words is "one billion, two hundred eleven million, forty-three thousand, two hundred thirteen".