1011221211 has 128 divisors (see below), whose sum is σ = 1961164800. Its totient is φ = 446031360.

The previous prime is 1011221207. The next prime is 1011221221. The reversal of 1011221211 is 1121221101.

It is not a de Polignac number, because 1011221211 - 2² = 1011221207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011221221) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2110870 + ... + 2111348.

It is an arithmetic number, because the mean of its divisors is an integer number (15321600).

Almost surely, 2^1011221211 is an apocalyptic number.

1011221211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1011221211 is a deficient number, since it is larger than the sum of its proper divisors (949943589).

1011221211 is a wasteful number, since it uses less digits than its factorization.

1011221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1011221211 is about 31799.7045740994. The cubic root of 1011221211 is about 1003.7264996175.

Adding to 1011221211 its reverse (1121221101), we get a palindrome (2132442312).

It can be divided in two parts, 1011 and 221211, that added together give a palindrome (222222).

The spelling of 1011221211 in words is "one billion, eleven million, two hundred twenty-one thousand, two hundred eleven".