202021202022021 has 24 divisors (see below), whose sum is σ = 298929015304920. Its totient is φ = 131394438144000.

The previous prime is 202021202021999. The next prime is 202021202022121. The reversal of 202021202022021 is 120220202120202.

202021202022021 is a `hidden beast` number, since 20 + 202 + 1 + 202 + 0 + 220 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3799750997025 + 198221451024996 = 1949295^2 + 14079114^2 .

It is not a de Polignac number, because 202021202022021 - 2²² = 202021197827717 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202021202021985 and 202021202022003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202021202022121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30574471 + ... + 36590171.

It is an arithmetic number, because the mean of its divisors is an integer number (12455375637705).

Almost surely, 2^{202021202022021} is an apocalyptic number.

It is an amenable number.

202021202022021 is a deficient number, since it is larger than the sum of its proper divisors (96907813282899).

202021202022021 is a wasteful number, since it uses less digits than its factorization.

202021202022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6106757 (or 6106754 counting only the distinct ones).

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

Adding to 202021202022021 its reverse (120220202120202), we get a palindrome (322241404142223).

The spelling of 202021202022021 in words is "two hundred two trillion, twenty-one billion, two hundred two million, twenty-two thousand, twenty-one".