1011211121 has 4 divisors (see below), whose sum is σ = 1046080500. Its totient is φ = 976341744.

The previous prime is 1011211079. The next prime is 1011211127. The reversal of 1011211121 is 1211121101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 869601121 + 141610000 = 29489^2 + 11900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011211121 - 2⁶ = 1011211057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011211127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17434646 + ... + 17434703.

It is an arithmetic number, because the mean of its divisors is an integer number (261520125).

Almost surely, 2^1011211121 is an apocalyptic number.

It is an amenable number.

1011211121 is a deficient number, since it is larger than the sum of its proper divisors (34869379).

1011211121 is an equidigital number, since it uses as much as digits as its factorization.

1011211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34869378.

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

The square root of 1011211121 is about 31799.5459244311. The cubic root of 1011211121 is about 1003.7231612006.

Adding to 1011211121 its reverse (1211121101), we get a palindrome (2222332222).

It can be divided in two parts, 101 and 1211121, that multiplied together give a palindrome (122323221).

The spelling of 1011211121 in words is "one billion, eleven million, two hundred eleven thousand, one hundred twenty-one".