1213111133 has 16 divisors (see below), whose sum is σ = 1315512576. Its totient is φ = 1112041920.

The previous prime is 1213111121. The next prime is 1213111139. The reversal of 1213111133 is 3311113121.

It is a cyclic number.

It is not a de Polignac number, because 1213111133 - 2¹² = 1213107037 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 (1213111139) 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, 1775810 + ... + 1776492.

It is an arithmetic number, because the mean of its divisors is an integer number (82219536).

Almost surely, 2^1213111133 is an apocalyptic number.

1213111133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1213111133 is a deficient number, since it is larger than the sum of its proper divisors (102401443).

1213111133 is a wasteful number, since it uses less digits than its factorization.

1213111133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444.

The product of its digits is 54, while the sum is 17.

The square root of 1213111133 is about 34829.7449459510. The cubic root of 1213111133 is about 1066.5147417196.

Adding to 1213111133 its reverse (3311113121), we get a palindrome (4524224254).

The spelling of 1213111133 in words is "one billion, two hundred thirteen million, one hundred eleven thousand, one hundred thirty-three".