1011112021021 has 24 divisors (see below), whose sum is σ = 1090139022720. Its totient is φ = 935204187456.

The previous prime is 1011112021013. The next prime is 1011112021057. The reversal of 1011112021021 is 1201202111101.

It is a happy number.

It is not a de Polignac number, because 1011112021021 - 2³ = 1011112021013 is a prime.

It is a super-2 number, since 2×1011112021021² (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 = 1011112020992 and 1011112021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011112021001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102823521 + ... + 102833353.

It is an arithmetic number, because the mean of its divisors is an integer number (45422459280).

Almost surely, 2^{1011112021021} is an apocalyptic number.

It is an amenable number.

1011112021021 is a deficient number, since it is larger than the sum of its proper divisors (79027001699).

1011112021021 is an equidigital number, since it uses as much as digits as its factorization.

1011112021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12865 (or 12822 counting only the distinct ones).

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

Adding to 1011112021021 its reverse (1201202111101), we get a palindrome (2212314132122).

The spelling of 1011112021021 in words is "one trillion, eleven billion, one hundred twelve million, twenty-one thousand, twenty-one".