1121211210021 has 32 divisors (see below), whose sum is σ = 1748054457600. Its totient is φ = 638974228032.

The previous prime is 1121211209977. The next prime is 1121211210043. The reversal of 1121211210021 is 1200121121211.

It is a happy number.

It is not a de Polignac number, because 1121211210021 - 2¹⁸ = 1121210947877 is a prime.

It is a super-2 number, since 2×1121211210021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121211210221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1076790 + ... + 1844423.

It is an arithmetic number, because the mean of its divisors is an integer number (54626701800).

Almost surely, 2^{1121211210021} is an apocalyptic number.

It is an amenable number.

1121211210021 is a deficient number, since it is larger than the sum of its proper divisors (626843247579).

1121211210021 is an equidigital number, since it uses as much as digits as its factorization.

1121211210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2921610 (or 2921596 counting only the distinct ones).

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

Adding to 1121211210021 its reverse (1200121121211), we get a palindrome (2321332331232).

The spelling of 1121211210021 in words is "one trillion, one hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, twenty-one".