20202012321221 has 4 divisors (see below), whose sum is σ = 20205019027200. Its totient is φ = 20199005615244.

The previous prime is 20202012321107. The next prime is 20202012321229. The reversal of 20202012321221 is 12212321020202.

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 a de Polignac number, because none of the positive numbers 2^k-20202012321221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202012321193 and 20202012321202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202012321229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1503342911 + ... + 1503356348.

It is an arithmetic number, because the mean of its divisors is an integer number (5051254756800).

Almost surely, 2^{20202012321221} is an apocalyptic number.

It is an amenable number.

20202012321221 is a deficient number, since it is larger than the sum of its proper divisors (3006705979).

20202012321221 is an equidigital number, since it uses as much as digits as its factorization.

20202012321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006705978.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20202012321221 its reverse (12212321020202), we get a palindrome (32414333341423).

The spelling of 20202012321221 in words is "twenty trillion, two hundred two billion, twelve million, three hundred twenty-one thousand, two hundred twenty-one".