1211211000121 has 8 divisors (see below), whose sum is σ = 1221958742760. Its totient is φ = 1200463767552.

The previous prime is 1211211000119. The next prime is 1211211000137. The reversal of 1211211000121 is 1210001121121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5473040400 + 1205737959721 = 73980^2 + 1098061^2 .

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 1211211000121 - 2¹ = 1211211000119 is a prime.

It is a super-2 number, since 2×1211211000121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211211000191) 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 7 ways as a sum of consecutive naturals, for example, 5900865 + ... + 6102673.

It is an arithmetic number, because the mean of its divisors is an integer number (152744842845).

Almost surely, 2^{1211211000121} is an apocalyptic number.

It is an amenable number.

1211211000121 is a deficient number, since it is larger than the sum of its proper divisors (10747742639).

1211211000121 is a wasteful number, since it uses less digits than its factorization.

1211211000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255035.

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

Adding to 1211211000121 its reverse (1210001121121), we get a palindrome (2421212121242).

The spelling of 1211211000121 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty-one", and thus it is an aban number.