20203121103211 has 4 divisors (see below), whose sum is σ = 20203364653024. Its totient is φ = 20202877553400.

The previous prime is 20203121103167. The next prime is 20203121103317. The reversal of 20203121103211 is 11230112130202.

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

It is a cyclic number.

It is not a de Polignac number, because 20203121103211 - 2⁹ = 20203121102699 is a prime.

It is a super-2 number, since 2×20203121103211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20203121103911) 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, 121650435 + ... + 121816396.

It is an arithmetic number, because the mean of its divisors is an integer number (5050841163256).

Almost surely, 2^{20203121103211} is an apocalyptic number.

20203121103211 is a deficient number, since it is larger than the sum of its proper divisors (243549813).

20203121103211 is an equidigital number, since it uses as much as digits as its factorization.

20203121103211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243549812.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20203121103211 its reverse (11230112130202), we get a palindrome (31433233233413).

The spelling of 20203121103211 in words is "twenty trillion, two hundred three billion, one hundred twenty-one million, one hundred three thousand, two hundred eleven".