1011221112021 has 12 divisors (see below), whose sum is σ = 1380379719168. Its totient is φ = 658469557704.

The previous prime is 1011221111987. The next prime is 1011221112049. The reversal of 1011221112021 is 1202111221101.

It is a happy number.

It is not a de Polignac number, because 1011221112021 - 2⁷ = 1011221111893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221112091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91144725 + ... + 91155818.

It is an arithmetic number, because the mean of its divisors is an integer number (115031643264).

Almost surely, 2^{1011221112021} is an apocalyptic number.

It is an amenable number.

1011221112021 is a deficient number, since it is larger than the sum of its proper divisors (369158607147).

1011221112021 is an equidigital number, since it uses as much as digits as its factorization.

1011221112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182300632 (or 182300589 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1011221112021 its reverse (1202111221101), we get a palindrome (2213332333122).

The spelling of 1011221112021 in words is "one trillion, eleven billion, two hundred twenty-one million, one hundred twelve thousand, twenty-one".