212100021120221 has 16 divisors (see below), whose sum is σ = 232194114542208. Its totient is φ = 192546688420800.

The previous prime is 212100021120203. The next prime is 212100021120277. The reversal of 212100021120221 is 122021120001212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212100021120221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212100021120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100021128221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14307371 + ... + 25077896.

It is an arithmetic number, because the mean of its divisors is an integer number (14512132158888).

Almost surely, 2^{212100021120221} is an apocalyptic number.

It is an amenable number.

212100021120221 is a deficient number, since it is larger than the sum of its proper divisors (20094093421987).

212100021120221 is a wasteful number, since it uses less digits than its factorization.

212100021120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39392132.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212100021120221 its reverse (122021120001212), we get a palindrome (334121141121433).

The spelling of 212100021120221 in words is "two hundred twelve trillion, one hundred billion, twenty-one million, one hundred twenty thousand, two hundred twenty-one".