1211244213 has 4 divisors (see below), whose sum is σ = 1614992288. Its totient is φ = 807496140.

The previous prime is 1211244211. The next prime is 1211244227. The reversal of 1211244213 is 3124421121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3124421121 = 3 ⋅1041473707.

It is not a de Polignac number, because 1211244213 - 2¹ = 1211244211 is a prime.

It is a super-2 number, since 2×1211244213² = 2934225087051978738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211244213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211244211) 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, 201874033 + ... + 201874038.

It is an arithmetic number, because the mean of its divisors is an integer number (403748072).

Almost surely, 2^1211244213 is an apocalyptic number.

It is an amenable number.

1211244213 is a deficient number, since it is larger than the sum of its proper divisors (403748075).

1211244213 is an equidigital number, since it uses as much as digits as its factorization.

1211244213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403748074.

The product of its digits is 384, while the sum is 21.

The square root of 1211244213 is about 34802.9339711467. The cubic root of 1211244213 is about 1065.9673557676.

Adding to 1211244213 its reverse (3124421121), we get a palindrome (4335665334).

The spelling of 1211244213 in words is "one billion, two hundred eleven million, two hundred forty-four thousand, two hundred thirteen".