20203212202021 has 4 divisors (see below), whose sum is σ = 20584404885132. Its totient is φ = 19822019518912.

The previous prime is 20203212201961. The next prime is 20203212202039. The reversal of 20203212202021 is 12020221230202.

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 5230762371396 + 14972449830625 = 2287086^2 + 3869425^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203212202021 - 2¹⁷ = 20203212070949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20203212202021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203212202051) 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, 190596341476 + ... + 190596341581.

It is an arithmetic number, because the mean of its divisors is an integer number (5146101221283).

Almost surely, 2^{20203212202021} is an apocalyptic number.

It is an amenable number.

20203212202021 is a deficient number, since it is larger than the sum of its proper divisors (381192683111).

20203212202021 is an equidigital number, since it uses as much as digits as its factorization.

20203212202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381192683110.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20203212202021 its reverse (12020221230202), we get a palindrome (32223433432223).

The spelling of 20203212202021 in words is "twenty trillion, two hundred three billion, two hundred twelve million, two hundred two thousand, twenty-one".