212122020210021 has 12 divisors (see below), whose sum is σ = 322524709091520. Its totient is φ = 133971802237800.

The previous prime is 212122020210007. The next prime is 212122020210047. The reversal of 212122020210021 is 120012020221212.

It is a happy number.

212122020210021 is a `hidden beast` number, since 2 + 121 + 220 + 202 + 100 + 21 = 666.

It is not a de Polignac number, because 212122020210021 - 2²² = 212122016015717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212122020209976 and 212122020210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122020200021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 620239825005 + ... + 620239825346.

It is an arithmetic number, because the mean of its divisors is an integer number (26877059090960).

Almost surely, 2^{212122020210021} is an apocalyptic number.

It is an amenable number.

212122020210021 is a deficient number, since it is larger than the sum of its proper divisors (110402688881499).

212122020210021 is a wasteful number, since it uses less digits than its factorization.

212122020210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240479650376 (or 1240479650373 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212122020210021 its reverse (120012020221212), we get a palindrome (332134040431233).

The spelling of 212122020210021 in words is "two hundred twelve trillion, one hundred twenty-two billion, twenty million, two hundred ten thousand, twenty-one".