1210021211211 has 4 divisors (see below), whose sum is σ = 1613361614952. Its totient is φ = 806680807472.

The previous prime is 1210021211183. The next prime is 1210021211227. The reversal of 1210021211211 is 1121121200121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210021211211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1210021211911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201670201866 + ... + 201670201871.

It is an arithmetic number, because the mean of its divisors is an integer number (403340403738).

Almost surely, 2^{1210021211211} is an apocalyptic number.

1210021211211 is a deficient number, since it is larger than the sum of its proper divisors (403340403741).

1210021211211 is an equidigital number, since it uses as much as digits as its factorization.

1210021211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403340403740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1210021211211 its reverse (1121121200121), we get a palindrome (2331142411332).

The spelling of 1210021211211 in words is "one trillion, two hundred ten billion, twenty-one million, two hundred eleven thousand, two hundred eleven".