1211121101021 has 8 divisors (see below), whose sum is σ = 1304293350360. Its totient is φ = 1117950149952.

The previous prime is 1211121100997. The next prime is 1211121101039. The reversal of 1211121101021 is 1201011211121.

It can be written as a sum of positive squares in 4 ways, for example, as 3570660025 + 1207550440996 = 59755^2 + 1098886^2 .

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 1211121101021 - 2¹⁴ = 1211121084637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211121100987 and 1211121101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121101621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2567315 + ... + 3002223.

It is an arithmetic number, because the mean of its divisors is an integer number (163036668795).

Almost surely, 2^{1211121101021} is an apocalyptic number.

It is an amenable number.

1211121101021 is a deficient number, since it is larger than the sum of its proper divisors (93172249339).

1211121101021 is a wasteful number, since it uses less digits than its factorization.

1211121101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649135.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211121101021 its reverse (1201011211121), we get a palindrome (2412132312142).

The spelling of 1211121101021 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred one thousand, twenty-one".