212201122121021 has 4 divisors (see below), whose sum is σ = 231492133222944. Its totient is φ = 192910111019100.

The previous prime is 212201122121003. The next prime is 212201122121041. The reversal of 212201122121021 is 120121221102212.

212201122121021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212201122121021 - 2⁴² = 207803075609917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212201122120984 and 212201122121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201122121041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9645505550945 + ... + 9645505550966.

It is an arithmetic number, because the mean of its divisors is an integer number (57873033305736).

Almost surely, 2^{212201122121021} is an apocalyptic number.

It is an amenable number.

212201122121021 is a deficient number, since it is larger than the sum of its proper divisors (19291011101923).

212201122121021 is a wasteful number, since it uses less digits than its factorization.

212201122121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19291011101922.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212201122121021 its reverse (120121221102212), we get a palindrome (332322343223233).

The spelling of 212201122121021 in words is "two hundred twelve trillion, two hundred one billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".