212202110220021 has 24 divisors (see below), whose sum is σ = 311634636242904. Its totient is φ = 139106200527360.

The previous prime is 212202110219999. The next prime is 212202110220031. The reversal of 212202110220021 is 120022011202212.

It is a happy number.

212202110220021 is a `hidden beast` number, since 212 + 2 + 0 + 211 + 0 + 220 + 0 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7308966320100 + 204893143899921 = 2703510^2 + 14314089^2 .

It is not a de Polignac number, because 212202110220021 - 2³⁴ = 212184930350837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212202110219976 and 212202110220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202110220031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57549456 + ... + 61125641.

It is an arithmetic number, because the mean of its divisors is an integer number (12984776510121).

Almost surely, 2^{212202110220021} is an apocalyptic number.

It is an amenable number.

212202110220021 is a deficient number, since it is larger than the sum of its proper divisors (99432526022883).

212202110220021 is a wasteful number, since it uses less digits than its factorization.

212202110220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118678421 (or 118678418 counting only the distinct ones).

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

Adding to 212202110220021 its reverse (120022011202212), we get a palindrome (332224121422233).

The spelling of 212202110220021 in words is "two hundred twelve trillion, two hundred two billion, one hundred ten million, two hundred twenty thousand, twenty-one".