1212021211 has 4 divisors (see below), whose sum is σ = 1212163624. Its totient is φ = 1211878800.

The previous prime is 1212021169. The next prime is 1212021221. The reversal of 1212021211 is 1121202121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212021211 - 2⁹ = 1212020699 is a prime.

It is a deceptive number, since it divides R_1212021210.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212021191 and 1212021200.

It is not an unprimeable number, because it can be changed into a prime (1212021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57570 + ... + 75751.

It is an arithmetic number, because the mean of its divisors is an integer number (303040906).

Almost surely, 2^1212021211 is an apocalyptic number.

1212021211 is a deficient number, since it is larger than the sum of its proper divisors (142413).

1212021211 is an equidigital number, since it uses as much as digits as its factorization.

1212021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142412.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1212021211 is about 34814.0950047535. The cubic root of 1212021211 is about 1066.1952419508.

Adding to 1212021211 its reverse (1121202121), we get a palindrome (2333223332).

The spelling of 1212021211 in words is "one billion, two hundred twelve million, twenty-one thousand, two hundred eleven".