1212201011 has 4 divisors (see below), whose sum is σ = 1385372592. Its totient is φ = 1039029432.

The previous prime is 1212200999. The next prime is 1212201019. The reversal of 1212201011 is 1101022121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1101022121 = 23 ⋅47870527.

It is not a de Polignac number, because 1212201011 - 2¹⁴ = 1212184627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212200983 and 1212201001.

It is not an unprimeable number, because it can be changed into a prime (1212201019) 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 3 ways as a sum of consecutive naturals, for example, 86585780 + ... + 86585793.

It is an arithmetic number, because the mean of its divisors is an integer number (346343148).

Almost surely, 2^1212201011 is an apocalyptic number.

1212201011 is a deficient number, since it is larger than the sum of its proper divisors (173171581).

1212201011 is an equidigital number, since it uses as much as digits as its factorization.

1212201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173171580.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1212201011 is about 34816.6771964241. The cubic root of 1212201011 is about 1066.2479617173.

Adding to 1212201011 its reverse (1101022121), we get a palindrome (2313223132).

The spelling of 1212201011 in words is "one billion, two hundred twelve million, two hundred one thousand, eleven".