1111210211021 has 4 divisors (see below), whose sum is σ = 1123695719100. Its totient is φ = 1098724702944.

The previous prime is 1111210211017. The next prime is 1111210211087. The reversal of 1111210211021 is 1201120121111.

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 68952982921 + 1042257228100 = 262589^2 + 1020910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111210211021 - 2² = 1111210211017 is a prime.

It is a super-4 number, since 4×1111210211021⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111210210987 and 1111210211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111210211821) 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 3 ways as a sum of consecutive naturals, for example, 6242753906 + ... + 6242754083.

It is an arithmetic number, because the mean of its divisors is an integer number (280923929775).

Almost surely, 2^{1111210211021} is an apocalyptic number.

It is an amenable number.

1111210211021 is a deficient number, since it is larger than the sum of its proper divisors (12485508079).

1111210211021 is an equidigital number, since it uses as much as digits as its factorization.

1111210211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12485508078.

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

Adding to 1111210211021 its reverse (1201120121111), we get a palindrome (2312330332132).

It can be divided in two parts, 1111210 and 211021, that added together give a palindrome (1322231).

The spelling of 1111210211021 in words is "one trillion, one hundred eleven billion, two hundred ten million, two hundred eleven thousand, twenty-one".