1111112021 has 2 divisors, whose sum is σ = 1111112022. Its totient is φ = 1111112020.

The previous prime is 1111111999. The next prime is 1111112029. The reversal of 1111112021 is 1202111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 961930225 + 149181796 = 31015^2 + 12214^2 .

It is an emirp because it is prime and its reverse (1202111111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111112021 - 2⁶ = 1111111957 is a prime.

It is a super-3 number, since 3×1111112021³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1111111993 and 1111112011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111112029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555556010 + 555556011.

It is an arithmetic number, because the mean of its divisors is an integer number (555556011).

Almost surely, 2^1111112021 is an apocalyptic number.

It is an amenable number.

1111112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111112021 is an equidigital number, since it uses as much as digits as its factorization.

1111112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1111112021 is about 33333.3469816639. The cubic root of 1111112021 is about 1035.7444513748.

Adding to 1111112021 its reverse (1202111111), we get a palindrome (2313223132).

It can be divided in two parts, 11111 and 12021, that multiplied together give a palindrome (133565331).

The spelling of 1111112021 in words is "one billion, one hundred eleven million, one hundred twelve thousand, twenty-one".