20202001222021 has 8 divisors (see below), whose sum is σ = 20204257549784. Its totient is φ = 20199745059840.

The previous prime is 20202001221967. The next prime is 20202001222027. The reversal of 20202001222021 is 12022210020202.

It can be written as a sum of positive squares in 4 ways, for example, as 2375991030625 + 17826010191396 = 1541425^2 + 4222086^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20202001222021 - 2⁴¹ = 18002977966469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202001221986 and 20202001222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202001222027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624408181 + ... + 624440533.

It is an arithmetic number, because the mean of its divisors is an integer number (2525532193723).

Almost surely, 2^{20202001222021} is an apocalyptic number.

It is an amenable number.

20202001222021 is a deficient number, since it is larger than the sum of its proper divisors (2256327763).

20202001222021 is a wasteful number, since it uses less digits than its factorization.

20202001222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82791.

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

Adding to 20202001222021 its reverse (12022210020202), we get a palindrome (32224211242223).

The spelling of 20202001222021 in words is "twenty trillion, two hundred two billion, one million, two hundred twenty-two thousand, twenty-one".