1231230213011 has 4 divisors (see below), whose sum is σ = 1231373437872. Its totient is φ = 1231086988152.

The previous prime is 1231230212959. The next prime is 1231230213013. The reversal of 1231230213011 is 1103120321321.

It is a happy number.

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 1231230213011 - 2¹⁰ = 1231230211987 is a prime.

It is a super-2 number, since 2×1231230213011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231230213013) 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, 71599535 + ... + 71616728.

It is an arithmetic number, because the mean of its divisors is an integer number (307843359468).

Almost surely, 2^{1231230213011} is an apocalyptic number.

1231230213011 is a deficient number, since it is larger than the sum of its proper divisors (143224861).

1231230213011 is an equidigital number, since it uses as much as digits as its factorization.

1231230213011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143224860.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1231230213011 its reverse (1103120321321), we get a palindrome (2334350534332).

The spelling of 1231230213011 in words is "one trillion, two hundred thirty-one billion, two hundred thirty million, two hundred thirteen thousand, eleven".