1111211020021 has 4 divisors (see below), whose sum is σ = 1114568153344. Its totient is φ = 1107853886700.

The previous prime is 1111211020019. The next prime is 1111211020037. The reversal of 1111211020021 is 1200201121111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1111211020021 - 2¹ = 1111211020019 is a prime.

It is a super-2 number, since 2×1111211020021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111211019983 and 1111211020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111211020061) 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, 1678566165 + ... + 1678566826.

It is an arithmetic number, because the mean of its divisors is an integer number (278642038336).

Almost surely, 2^{1111211020021} is an apocalyptic number.

It is an amenable number.

1111211020021 is a deficient number, since it is larger than the sum of its proper divisors (3357133323).

1111211020021 is an equidigital number, since it uses as much as digits as its factorization.

1111211020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357133322.

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

Adding to 1111211020021 its reverse (1200201121111), we get a palindrome (2311412141132).

The spelling of 1111211020021 in words is "one trillion, one hundred eleven billion, two hundred eleven million, twenty thousand, twenty-one".