1211011222331 has 4 divisors (see below), whose sum is σ = 1211067405432. Its totient is φ = 1210955039232.

The previous prime is 1211011222277. The next prime is 1211011222339. The reversal of 1211011222331 is 1332221101121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211011222331 is a prime.

It is a super-2 number, since 2×1211011222331² (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 (1211011222339) 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, 28059206 + ... + 28102331.

It is an arithmetic number, because the mean of its divisors is an integer number (302766851358).

Almost surely, 2^{1211011222331} is an apocalyptic number.

1211011222331 is a deficient number, since it is larger than the sum of its proper divisors (56183101).

1211011222331 is an equidigital number, since it uses as much as digits as its factorization.

1211011222331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56183100.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1211011222331 its reverse (1332221101121), we get a palindrome (2543232323452).

The spelling of 1211011222331 in words is "one trillion, two hundred eleven billion, eleven million, two hundred twenty-two thousand, three hundred thirty-one".