20202122002021 has 4 divisors (see below), whose sum is σ = 20402143012044. Its totient is φ = 20002100992000.

The previous prime is 20202122001953. The next prime is 20202122002031. The reversal of 20202122002021 is 12020022120202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19993194390625 + 208927611396 = 4471375^2 + 457086^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202122002021 - 2²³ = 20202113613413 is a prime.

It is a super-3 number, since 3×20202122002021³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202122001986 and 20202122002004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202122002031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100010504860 + ... + 100010505061.

It is an arithmetic number, because the mean of its divisors is an integer number (5100535753011).

Almost surely, 2^{20202122002021} is an apocalyptic number.

It is an amenable number.

20202122002021 is a deficient number, since it is larger than the sum of its proper divisors (200021010023).

20202122002021 is a wasteful number, since it uses less digits than its factorization.

20202122002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200021010022.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20202122002021 its reverse (12020022120202), we get a palindrome (32222144122223).

The spelling of 20202122002021 in words is "twenty trillion, two hundred two billion, one hundred twenty-two million, two thousand, twenty-one".