1213211279 has 16 divisors (see below), whose sum is σ = 1432952640. Its totient is φ = 1005527040.

The previous prime is 1213211267. The next prime is 1213211297. The reversal of 1213211279 is 9721123121.

It is not a de Polignac number, because 1213211279 - 2¹² = 1213207183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213201279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13727 + ... + 51135.

It is an arithmetic number, because the mean of its divisors is an integer number (89559540).

Almost surely, 2^1213211279 is an apocalyptic number.

1213211279 is a deficient number, since it is larger than the sum of its proper divisors (219741361).

1213211279 is a wasteful number, since it uses less digits than its factorization.

1213211279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37570.

The product of its digits is 1512, while the sum is 29.

The square root of 1213211279 is about 34831.1825667748. The cubic root of 1213211279 is about 1066.5440889200.

The spelling of 1213211279 in words is "one billion, two hundred thirteen million, two hundred eleven thousand, two hundred seventy-nine".