1211120202031 has 4 divisors (see below), whose sum is σ = 1211598719064. Its totient is φ = 1210641685000.

The previous prime is 1211120202011. The next prime is 1211120202049. The reversal of 1211120202031 is 1302020211121.

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 1211120202031 - 2¹³ = 1211120193839 is a prime.

It is a super-2 number, since 2×1211120202031² (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 = 1211120201996 and 1211120202014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211120202011) 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, 239254720 + ... + 239259781.

It is an arithmetic number, because the mean of its divisors is an integer number (302899679766).

Almost surely, 2^{1211120202031} is an apocalyptic number.

1211120202031 is a deficient number, since it is larger than the sum of its proper divisors (478517033).

1211120202031 is an equidigital number, since it uses as much as digits as its factorization.

1211120202031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478517032.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1211120202031 its reverse (1302020211121), we get a palindrome (2513140413152).

The spelling of 1211120202031 in words is "one trillion, two hundred eleven billion, one hundred twenty million, two hundred two thousand, thirty-one".