1111212221021 has 48 divisors (see below), whose sum is σ = 1365650979840. Its totient is φ = 899738864640.

The previous prime is 1111212220967. The next prime is 1111212221029. The reversal of 1111212221021 is 1201222121111.

It is not a de Polignac number, because 1111212221021 - 2²⁶ = 1111145112157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212221029) 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 47 ways as a sum of consecutive naturals, for example, 52353191 + ... + 52374411.

It is an arithmetic number, because the mean of its divisors is an integer number (28451062080).

Almost surely, 2^{1111212221021} is an apocalyptic number.

It is an amenable number.

1111212221021 is a deficient number, since it is larger than the sum of its proper divisors (254438758819).

1111212221021 is a wasteful number, since it uses less digits than its factorization.

1111212221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21834 (or 21827 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1111212221021 its reverse (1201222121111), we get a palindrome (2312434342132).

The spelling of 1111212221021 in words is "one trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, twenty-one".