1011231211 has 4 divisors (see below), whose sum is σ = 1012194424. Its totient is φ = 1010268000.

The previous prime is 1011231197. The next prime is 1011231223. The reversal of 1011231211 is 1121321101.

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 1011231211 - 2²⁵ = 977676779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011231191 and 1011231200.

It is not an unprimeable number, because it can be changed into a prime (1011231251) 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, 480030 + ... + 482131.

It is an arithmetic number, because the mean of its divisors is an integer number (253048606).

Almost surely, 2^1011231211 is an apocalyptic number.

1011231211 is a deficient number, since it is larger than the sum of its proper divisors (963213).

1011231211 is an equidigital number, since it uses as much as digits as its factorization.

1011231211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963212.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1011231211 is about 31799.8618078758. The cubic root of 1011231211 is about 1003.7298082348.

Adding to 1011231211 its reverse (1121321101), we get a palindrome (2132552312).

The spelling of 1011231211 in words is "one billion, eleven million, two hundred thirty-one thousand, two hundred eleven".