212002220202021 has 24 divisors (see below), whose sum is σ = 324456446073240. Its totient is φ = 132931664971776.

The previous prime is 212002220201983. The next prime is 212002220202029. The reversal of 212002220202021 is 120202022200212.

212002220202021 is a `hidden beast` number, since 21 + 200 + 2 + 220 + 20 + 202 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 32683071381921 + 179319148820100 = 5716911^2 + 13391010^2 .

It is not a de Polignac number, because 212002220202021 - 2¹⁵ = 212002220169253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212002220201985 and 212002220202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212002220202029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 465062790 + ... + 465518423.

It is an arithmetic number, because the mean of its divisors is an integer number (13519018586385).

Almost surely, 2^{212002220202021} is an apocalyptic number.

It is an amenable number.

212002220202021 is a deficient number, since it is larger than the sum of its proper divisors (112454225871219).

212002220202021 is a wasteful number, since it uses less digits than its factorization.

212002220202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930582725 (or 930582722 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212002220202021 its reverse (120202022200212), we get a palindrome (332204242402233).

The spelling of 212002220202021 in words is "two hundred twelve trillion, two billion, two hundred twenty million, two hundred two thousand, twenty-one".