1213420311 has 16 divisors (see below), whose sum is σ = 1839467520. Its totient is φ = 790133400.

The previous prime is 1213420289. The next prime is 1213420331. The reversal of 1213420311 is 1130243121.

1213420311 is a `hidden beast` number, since 1 + 213 + 420 + 31 + 1 = 666.

It is not a de Polignac number, because 1213420311 - 2⁵ = 1213420279 is a prime.

It is a super-2 number, since 2×1213420311² = 2944777702294673442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213420331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521415 + ... + 523736.

It is an arithmetic number, because the mean of its divisors is an integer number (114966720).

Almost surely, 2^1213420311 is an apocalyptic number.

1213420311 is a deficient number, since it is larger than the sum of its proper divisors (626047209).

1213420311 is a wasteful number, since it uses less digits than its factorization.

1213420311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045203 (or 1045197 counting only the distinct ones).

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

The square root of 1213420311 is about 34834.1830821393. The cubic root of 1213420311 is about 1066.6053393235.

Adding to 1213420311 its reverse (1130243121), we get a palindrome (2343663432).

The spelling of 1213420311 in words is "one billion, two hundred thirteen million, four hundred twenty thousand, three hundred eleven".