1213212111 has 8 divisors (see below), whose sum is σ = 1702753920. Its totient is φ = 766239192.

The previous prime is 1213212109. The next prime is 1213212137. The reversal of 1213212111 is 1112123121.

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

It is not a de Polignac number, because 1213212111 - 2¹ = 1213212109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213210111) 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 7 ways as a sum of consecutive naturals, for example, 10642155 + ... + 10642268.

It is an arithmetic number, because the mean of its divisors is an integer number (212844240).

Almost surely, 2^1213212111 is an apocalyptic number.

1213212111 is a deficient number, since it is larger than the sum of its proper divisors (489541809).

1213212111 is a wasteful number, since it uses less digits than its factorization.

1213212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21284445.

The product of its digits is 24, while the sum is 15.

The square root of 1213212111 is about 34831.1945100940. The cubic root of 1213212111 is about 1066.5443327259.

Adding to 1213212111 its reverse (1112123121), we get a palindrome (2325335232).

The spelling of 1213212111 in words is "one billion, two hundred thirteen million, two hundred twelve thousand, one hundred eleven".