212120202021221 has 8 divisors (see below), whose sum is σ = 228443585604864. Its totient is φ = 195797739147120.

The previous prime is 212120202021187. The next prime is 212120202021223. The reversal of 212120202021221 is 122120202021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212120202021221 is a prime.

It is a super-2 number, since 2×212120202021221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120202021193 and 212120202021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120202021223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229698845 + ... + 230620466.

It is an arithmetic number, because the mean of its divisors is an integer number (28555448200608).

Almost surely, 2^{212120202021221} is an apocalyptic number.

It is an amenable number.

212120202021221 is a deficient number, since it is larger than the sum of its proper divisors (16323383583643).

212120202021221 is a wasteful number, since it uses less digits than its factorization.

212120202021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460354771.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 212120202021221 its reverse (122120202021212), we get a palindrome (334240404042433).

Subtracting from 212120202021221 its reverse (122120202021212), we obtain a palindrome (90000000000009).

The spelling of 212120202021221 in words is "two hundred twelve trillion, one hundred twenty billion, two hundred two million, twenty-one thousand, two hundred twenty-one".