212121200211021 has 24 divisors (see below), whose sum is σ = 307131365661120. Its totient is φ = 141075335149056.

The previous prime is 212121200210999. The next prime is 212121200211073. The reversal of 212121200211021 is 120112002121212.

212121200211021 is a `hidden beast` number, since 21 + 212 + 1 + 200 + 211 + 0 + 21 = 666.

It is not a de Polignac number, because 212121200211021 - 2¹⁴ = 212121200194637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212121200210985 and 212121200211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121200211121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 589427280 + ... + 589787046.

It is an arithmetic number, because the mean of its divisors is an integer number (12797140235880).

Almost surely, 2^{212121200211021} is an apocalyptic number.

It is an amenable number.

212121200211021 is a deficient number, since it is larger than the sum of its proper divisors (95010165450099).

212121200211021 is a wasteful number, since it uses less digits than its factorization.

212121200211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516545 (or 516542 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 212121200211021 its reverse (120112002121212), we get a palindrome (332233202332233).

The spelling of 212121200211021 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred million, two hundred eleven thousand, twenty-one".