1311021213 has 8 divisors (see below), whose sum is σ = 1748237568. Its totient is φ = 873909504.

The previous prime is 1311021209. The next prime is 1311021233. The reversal of 1311021213 is 3121201131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311021213 - 2² = 1311021209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311021192 and 1311021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311021233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10356 + ... + 52242.

It is an arithmetic number, because the mean of its divisors is an integer number (218529696).

Almost surely, 2^1311021213 is an apocalyptic number.

It is an amenable number.

1311021213 is a deficient number, since it is larger than the sum of its proper divisors (437216355).

1311021213 is a wasteful number, since it uses less digits than its factorization.

1311021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52323.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311021213 is about 36208.0269139317. The cubic root of 1311021213 is about 1094.4684319692.

Adding to 1311021213 its reverse (3121201131), we get a palindrome (4432222344).

The spelling of 1311021213 in words is "one billion, three hundred eleven million, twenty-one thousand, two hundred thirteen".