212210120020221 has 40 divisors (see below), whose sum is σ = 322248387223928. Its totient is φ = 139134163968000.

The previous prime is 212210120020207. The next prime is 212210120020267. The reversal of 212210120020221 is 122020021012212.

It is a happy number.

212210120020221 is a `hidden beast` number, since 2 + 1 + 221 + 0 + 1 + 200 + 20 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 24094795736025 + 188115324284196 = 4908645^2 + 13715514^2 .

It is not a de Polignac number, because 212210120020221 - 2¹⁴ = 212210120003837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212210120020194 and 212210120020203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210120020271) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 31309341 + ... + 37479261.

Almost surely, 2^{212210120020221} is an apocalyptic number.

It is an amenable number.

212210120020221 is a deficient number, since it is larger than the sum of its proper divisors (110038267203707).

212210120020221 is an equidigital number, since it uses as much as digits as its factorization.

212210120020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6176955 (or 6176946 counting only the distinct ones).

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

Adding to 212210120020221 its reverse (122020021012212), we get a palindrome (334230141032433).

The spelling of 212210120020221 in words is "two hundred twelve trillion, two hundred ten billion, one hundred twenty million, twenty thousand, two hundred twenty-one".