20202221210021 has 4 divisors (see below), whose sum is σ = 20205813999072. Its totient is φ = 20198628420972.

The previous prime is 20202221209979. The next prime is 20202221210047. The reversal of 20202221210021 is 12001212220202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20202221210021 - 2¹⁰ = 20202221208997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202221810021) 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, 1796386091 + ... + 1796397336.

It is an arithmetic number, because the mean of its divisors is an integer number (5051453499768).

Almost surely, 2^{20202221210021} is an apocalyptic number.

It is an amenable number.

20202221210021 is a deficient number, since it is larger than the sum of its proper divisors (3592789051).

20202221210021 is an equidigital number, since it uses as much as digits as its factorization.

20202221210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592789050.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20202221210021 its reverse (12001212220202), we get a palindrome (32203433430223).

The spelling of 20202221210021 in words is "twenty trillion, two hundred two billion, two hundred twenty-one million, two hundred ten thousand, twenty-one".