1211021333131 has 4 divisors (see below), whose sum is σ = 1239184619992. Its totient is φ = 1182858046272.

The previous prime is 1211021333117. The next prime is 1211021333147. The reversal of 1211021333131 is 1313331201121.

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 1211021333131 - 2¹¹ = 1211021331083 is a prime.

It is a super-2 number, since 2×1211021333131² (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 (1211021333531) 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, 14081643366 + ... + 14081643451.

It is an arithmetic number, because the mean of its divisors is an integer number (309796154998).

Almost surely, 2^{1211021333131} is an apocalyptic number.

1211021333131 is a deficient number, since it is larger than the sum of its proper divisors (28163286861).

1211021333131 is an equidigital number, since it uses as much as digits as its factorization.

1211021333131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28163286860.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1211021333131 its reverse (1313331201121), we get a palindrome (2524352534252).

The spelling of 1211021333131 in words is "one trillion, two hundred eleven billion, twenty-one million, three hundred thirty-three thousand, one hundred thirty-one".