1021211211121 has 4 divisors (see below), whose sum is σ = 1081282458852. Its totient is φ = 961139963392.

The previous prime is 1021211211079. The next prime is 1021211211131. The reversal of 1021211211121 is 1211121121201.

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 424014554896 + 597196656225 = 651164^2 + 772785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021211211121 - 2¹³ = 1021211202929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021211211095 and 1021211211104.

It is not an unprimeable number, because it can be changed into a prime (1021211211131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30035623840 + ... + 30035623873.

It is an arithmetic number, because the mean of its divisors is an integer number (270320614713).

Almost surely, 2^{1021211211121} is an apocalyptic number.

It is an amenable number.

1021211211121 is a deficient number, since it is larger than the sum of its proper divisors (60071247731).

1021211211121 is an equidigital number, since it uses as much as digits as its factorization.

1021211211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60071247730.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1021211211121 its reverse (1211121121201), we get a palindrome (2232332332322).

The spelling of 1021211211121 in words is "one trillion, twenty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-one".