1211013011 has 4 divisors (see below), whose sum is σ = 1304167872. Its totient is φ = 1117858152.

The previous prime is 1211012821. The next prime is 1211013031. The reversal of 1211013011 is 1103101121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1103101121 = 137 ⋅8051833.

It is a cyclic number.

It is not a de Polignac number, because 1211013011 - 2²² = 1206818707 is a prime.

It is a super-2 number, since 2×1211013011² = 2933105025622572242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211012983 and 1211013001.

It is not an unprimeable number, because it can be changed into a prime (1211013031) 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, 46577411 + ... + 46577436.

It is an arithmetic number, because the mean of its divisors is an integer number (326041968).

Almost surely, 2^1211013011 is an apocalyptic number.

1211013011 is a deficient number, since it is larger than the sum of its proper divisors (93154861).

1211013011 is an equidigital number, since it uses as much as digits as its factorization.

1211013011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93154860.

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

The square root of 1211013011 is about 34799.6122248510. The cubic root of 1211013011 is about 1065.8995275888.

Adding to 1211013011 its reverse (1103101121), we get a palindrome (2314114132).

The spelling of 1211013011 in words is "one billion, two hundred eleven million, thirteen thousand, eleven".