1211212113 has 8 divisors (see below), whose sum is σ = 1616676768. Its totient is φ = 806611104.

The previous prime is 1211212063. The next prime is 1211212117. The reversal of 1211212113 is 3112121121.

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

It is not a de Polignac number, because 1211212113 - 2¹³ = 1211203921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211212092 and 1211212101.

It is not an unprimeable number, because it can be changed into a prime (1211212117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212631 + ... + 218252.

It is an arithmetic number, because the mean of its divisors is an integer number (202084596).

Almost surely, 2^1211212113 is an apocalyptic number.

It is an amenable number.

1211212113 is a deficient number, since it is larger than the sum of its proper divisors (405464655).

1211212113 is an equidigital number, since it uses as much as digits as its factorization.

1211212113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431823.

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

The square root of 1211212113 is about 34802.4728000756. The cubic root of 1211212113 is about 1065.9579390445.

Adding to 1211212113 its reverse (3112121121), we get a palindrome (4323333234).

The spelling of 1211212113 in words is "one billion, two hundred eleven million, two hundred twelve thousand, one hundred thirteen".