1213218371 has 2 divisors, whose sum is σ = 1213218372. Its totient is φ = 1213218370.

The previous prime is 1213218367. The next prime is 1213218373. The reversal of 1213218371 is 1738123121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213218371 - 2² = 1213218367 is a prime.

Together with 1213218373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1213218373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606609185 + 606609186.

It is an arithmetic number, because the mean of its divisors is an integer number (606609186).

Almost surely, 2^1213218371 is an apocalyptic number.

1213218371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213218371 is an equidigital number, since it uses as much as digits as its factorization.

1213218371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 1213218371 is about 34831.2843719550. The cubic root of 1213218371 is about 1066.5461671279.

It can be divided in two parts, 12132 and 18371, that added together give a palindrome (30503).

The spelling of 1213218371 in words is "one billion, two hundred thirteen million, two hundred eighteen thousand, three hundred seventy-one".