1211211011 has 2 divisors, whose sum is σ = 1211211012. Its totient is φ = 1211211010.

The previous prime is 1211210977. The next prime is 1211211041. The reversal of 1211211011 is 1101121121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1101121121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211211011 - 2²⁶ = 1144102147 is a prime.

It is a super-2 number, since 2×1211211011² = 2934064226335284242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211210983 and 1211211001.

It is not a weakly prime, because it can be changed into another prime (1211211041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605605505 + 605605506.

It is an arithmetic number, because the mean of its divisors is an integer number (605605506).

Almost surely, 2^1211211011 is an apocalyptic number.

1211211011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211211011 is an equidigital number, since it uses as much as digits as its factorization.

1211211011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1211211011 is about 34802.4569678636. The cubic root of 1211211011 is about 1065.9576157633.

Adding to 1211211011 its reverse (1101121121), we get a palindrome (2312332132).

The spelling of 1211211011 in words is "one billion, two hundred eleven million, two hundred eleven thousand, eleven".