1211222013 has 16 divisors (see below), whose sum is σ = 1700836800. Its totient is φ = 764588160.

The previous prime is 1211222009. The next prime is 1211222017. The reversal of 1211222013 is 3102221121.

It is an interprime number because it is at equal distance from previous prime (1211222009) and next prime (1211222017).

It is not a de Polignac number, because 1211222013 - 2² = 1211222009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211221983 and 1211222001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211222017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139483 + ... + 147911.

It is an arithmetic number, because the mean of its divisors is an integer number (106302300).

Almost surely, 2^1211222013 is an apocalyptic number.

It is an amenable number.

1211222013 is a deficient number, since it is larger than the sum of its proper divisors (489614787).

1211222013 is a wasteful number, since it uses less digits than its factorization.

1211222013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10972.

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

The square root of 1211222013 is about 34802.6150310577. The cubic root of 1211222013 is about 1065.9608432852.

Adding to 1211222013 its reverse (3102221121), we get a palindrome (4313443134).

The spelling of 1211222013 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, thirteen".