212321121021 has 32 divisors (see below), whose sum is σ = 317823467520. Its totient is φ = 140076173232.

The previous prime is 212321120993. The next prime is 212321121029. The reversal of 212321121021 is 120121123212.

It is not a de Polignac number, because 212321121021 - 2¹¹ = 212321118973 is a prime.

It is a super-2 number, since 2×212321121021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212321120985 and 212321121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212321121029) 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 31 ways as a sum of consecutive naturals, for example, 4109676 + ... + 4161018.

It is an arithmetic number, because the mean of its divisors is an integer number (9931983360).

Almost surely, 2^212321121021 is an apocalyptic number.

It is an amenable number.

212321121021 is a deficient number, since it is larger than the sum of its proper divisors (105502346499).

212321121021 is a wasteful number, since it uses less digits than its factorization.

212321121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52942 (or 52936 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212321121021 its reverse (120121123212), we get a palindrome (332442244233).

The spelling of 212321121021 in words is "two hundred twelve billion, three hundred twenty-one million, one hundred twenty-one thousand, twenty-one".