1213111311 has 8 divisors (see below), whose sum is σ = 1617642624. Its totient is φ = 808660440.

The previous prime is 1213111307. The next prime is 1213111327. The reversal of 1213111311 is 1131113121.

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

It is not a de Polignac number, because 1213111311 - 2² = 1213111307 is a prime.

It is a super-2 number, since 2×1213111311² = 2943278105752277442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213111351) 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, 50140 + ... + 70286.

It is an arithmetic number, because the mean of its divisors is an integer number (202205328).

Almost surely, 2^1213111311 is an apocalyptic number.

1213111311 is a deficient number, since it is larger than the sum of its proper divisors (404531313).

1213111311 is a wasteful number, since it uses less digits than its factorization.

1213111311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40221.

The product of its digits is 18, while the sum is 15.

The square root of 1213111311 is about 34829.7475012381. The cubic root of 1213111311 is about 1066.5147938829.

Adding to 1213111311 its reverse (1131113121), we get a palindrome (2344224432).

It can be divided in two parts, 1 and 213111311, that added together give a palindrome (213111312).

The spelling of 1213111311 in words is "one billion, two hundred thirteen million, one hundred eleven thousand, three hundred eleven".