212100001112021 has 4 divisors (see below), whose sum is σ = 231381819394944. Its totient is φ = 192818182829100.

The previous prime is 212100001112011. The next prime is 212100001112039. The reversal of 212100001112021 is 120211100001212.

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 a de Polignac number, because none of the positive numbers 2^k-212100001112021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212100001111987 and 212100001112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100001112011) 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, 9640909141445 + ... + 9640909141466.

It is an arithmetic number, because the mean of its divisors is an integer number (57845454848736).

Almost surely, 2^{212100001112021} is an apocalyptic number.

It is an amenable number.

212100001112021 is a deficient number, since it is larger than the sum of its proper divisors (19281818282923).

212100001112021 is a wasteful number, since it uses less digits than its factorization.

212100001112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19281818282922.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212100001112021 its reverse (120211100001212), we get a palindrome (332311101113233).

The spelling of 212100001112021 in words is "two hundred twelve trillion, one hundred billion, one million, one hundred twelve thousand, twenty-one".