1213120201231 has 4 divisors (see below), whose sum is σ = 1242708498864. Its totient is φ = 1183531903600.

The previous prime is 1213120201213. The next prime is 1213120201243. The reversal of 1213120201231 is 1321020213121.

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 1213120201231 - 2¹¹ = 1213120199183 is a prime.

It is a super-2 number, since 2×1213120201231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213120201199 and 1213120201208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213120201261) 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, 14794148755 + ... + 14794148836.

It is an arithmetic number, because the mean of its divisors is an integer number (310677124716).

Almost surely, 2^{1213120201231} is an apocalyptic number.

1213120201231 is a deficient number, since it is larger than the sum of its proper divisors (29588297633).

1213120201231 is an equidigital number, since it uses as much as digits as its factorization.

1213120201231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29588297632.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1213120201231 its reverse (1321020213121), we get a palindrome (2534140414352).

The spelling of 1213120201231 in words is "one trillion, two hundred thirteen billion, one hundred twenty million, two hundred one thousand, two hundred thirty-one".