1213321311 has 6 divisors (see below), whose sum is σ = 1752575240. Its totient is φ = 808880868.

The previous prime is 1213321303. The next prime is 1213321381. The reversal of 1213321311 is 1131233121.

1213321311 is a `hidden beast` number, since 1 + 21 + 332 + 1 + 311 = 666.

It is not a de Polignac number, because 1213321311 - 2³ = 1213321303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213321301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67406731 + ... + 67406748.

Almost surely, 2^1213321311 is an apocalyptic number.

1213321311 is a deficient number, since it is larger than the sum of its proper divisors (539253929).

1213321311 is a wasteful number, since it uses less digits than its factorization.

1213321311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134813485 (or 134813482 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1213321311 is about 34832.7620351875. The cubic root of 1213321311 is about 1066.5763312929.

Adding to 1213321311 its reverse (1131233121), we get a palindrome (2344554432).

The spelling of 1213321311 in words is "one billion, two hundred thirteen million, three hundred twenty-one thousand, three hundred eleven".