1213213111 has 16 divisors (see below), whose sum is σ = 1339413408. Its totient is φ = 1089712000.

The previous prime is 1213213103. The next prime is 1213213121. The reversal of 1213213111 is 1113123121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1213213111 - 2³ = 1213213103 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 (1213213121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 751341 + ... + 752953.

It is an arithmetic number, because the mean of its divisors is an integer number (83713338).

Almost surely, 2^1213213111 is an apocalyptic number.

1213213111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1213213111 is a deficient number, since it is larger than the sum of its proper divisors (126200297).

1213213111 is a wasteful number, since it uses less digits than its factorization.

1213213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402.

The product of its digits is 36, while the sum is 16.

The square root of 1213213111 is about 34831.2088650394. The cubic root of 1213213111 is about 1066.5446257618.

Adding to 1213213111 its reverse (1113123121), we get a palindrome (2326336232).

The spelling of 1213213111 in words is "one billion, two hundred thirteen million, two hundred thirteen thousand, one hundred eleven".