1231212221011 has 8 divisors (see below), whose sum is σ = 1233372008880. Its totient is φ = 1229054300928.

The previous prime is 1231212220969. The next prime is 1231212221021. The reversal of 1231212221011 is 1101222121321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231212221011 - 2⁹ = 1231212220499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231212221011.

It is not an unprimeable number, because it can be changed into a prime (1231212221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855855 + ... + 1787431.

It is an arithmetic number, because the mean of its divisors is an integer number (154171501110).

Almost surely, 2^{1231212221011} is an apocalyptic number.

1231212221011 is a deficient number, since it is larger than the sum of its proper divisors (2159787869).

1231212221011 is a wasteful number, since it uses less digits than its factorization.

1231212221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933893.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1231212221011 its reverse (1101222121321), we get a palindrome (2332434342332).

The spelling of 1231212221011 in words is "one trillion, two hundred thirty-one billion, two hundred twelve million, two hundred twenty-one thousand, eleven".