1231020310211 has 4 divisors (see below), whose sum is σ = 1232849464392. Its totient is φ = 1229191156032.

The previous prime is 1231020310199. The next prime is 1231020310213. The reversal of 1231020310211 is 1120130201321.

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 1231020310211 - 2³⁸ = 956142403267 is a prime.

It is a super-2 number, since 2×1231020310211² (a number of 25 digits) contains 22 as substring.

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 1231020310211.

It is not an unprimeable number, because it can be changed into a prime (1231020310213) 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 3 ways as a sum of consecutive naturals, for example, 914576081 + ... + 914577426.

It is an arithmetic number, because the mean of its divisors is an integer number (308212366098).

Almost surely, 2^{1231020310211} is an apocalyptic number.

1231020310211 is a deficient number, since it is larger than the sum of its proper divisors (1829154181).

1231020310211 is an equidigital number, since it uses as much as digits as its factorization.

1231020310211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829154180.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1231020310211 its reverse (1120130201321), we get a palindrome (2351150511532).

The spelling of 1231020310211 in words is "one trillion, two hundred thirty-one billion, twenty million, three hundred ten thousand, two hundred eleven".