1211023002011 has 4 divisors (see below), whose sum is σ = 1211026147032. Its totient is φ = 1211019856992.

The previous prime is 1211023001971. The next prime is 1211023002131. The reversal of 1211023002011 is 1102003201121.

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 1211023002011 - 2³⁰ = 1209949260187 is a prime.

It is a super-2 number, since 2×1211023002011² (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 (1211023002811) 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, 898670 + ... + 1797123.

It is an arithmetic number, because the mean of its divisors is an integer number (302756536758).

Almost surely, 2^{1211023002011} is an apocalyptic number.

1211023002011 is a deficient number, since it is larger than the sum of its proper divisors (3145021).

1211023002011 is an equidigital number, since it uses as much as digits as its factorization.

1211023002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145020.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1211023002011 its reverse (1102003201121), we get a palindrome (2313026203132).

The spelling of 1211023002011 in words is "one trillion, two hundred eleven billion, twenty-three million, two thousand, eleven".