1213011011 has 4 divisors (see below), whose sum is σ = 1213239552. Its totient is φ = 1212782472.

The previous prime is 1213011001. The next prime is 1213011077. The reversal of 1213011011 is 1101103121.

It is a happy number.

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 1213011011 - 2³⁰ = 139269187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213010983 and 1213011001.

It is not an unprimeable number, because it can be changed into a prime (1213011001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106115 + ... + 116988.

It is an arithmetic number, because the mean of its divisors is an integer number (303309888).

Almost surely, 2^1213011011 is an apocalyptic number.

1213011011 is a deficient number, since it is larger than the sum of its proper divisors (228541).

1213011011 is an equidigital number, since it uses as much as digits as its factorization.

1213011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228540.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1213011011 is about 34828.3076103333. The cubic root of 1213011011 is about 1066.4853999377.

Adding to 1213011011 its reverse (1101103121), we get a palindrome (2314114132).

The spelling of 1213011011 in words is "one billion, two hundred thirteen million, eleven thousand, eleven".