11211120121 has 8 divisors (see below), whose sum is σ = 11608126920. Its totient is φ = 10814807808.

The previous prime is 11211120077. The next prime is 11211120131. The reversal of 11211120121 is 12102111211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1619660025 + 9591460096 = 40245^2 + 97936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11211120121 - 2²⁷ = 11076902393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211120131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140656 + ... + 205441.

It is an arithmetic number, because the mean of its divisors is an integer number (1451015865).

Almost surely, 2^11211120121 is an apocalyptic number.

It is an amenable number.

11211120121 is a deficient number, since it is larger than the sum of its proper divisors (397006799).

11211120121 is a wasteful number, since it uses less digits than its factorization.

11211120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347243.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11211120121 its reverse (12102111211), we get a palindrome (23313231332).

The spelling of 11211120121 in words is "eleven billion, two hundred eleven million, one hundred twenty thousand, one hundred twenty-one".