20212121121103 has 4 divisors (see below), whose sum is σ = 20255965202088. Its totient is φ = 20168277040120.

The previous prime is 20212121121091. The next prime is 20212121121149. The reversal of 20212121121103 is 30112112121202.

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 20212121121103 - 2²¹ = 20212119023951 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 (20212121121193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21922039801 + ... + 21922040722.

It is an arithmetic number, because the mean of its divisors is an integer number (5063991300522).

Almost surely, 2^{20212121121103} is an apocalyptic number.

20212121121103 is a deficient number, since it is larger than the sum of its proper divisors (43844080985).

20212121121103 is an equidigital number, since it uses as much as digits as its factorization.

20212121121103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43844080984.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 20212121121103 its reverse (30112112121202), we get a palindrome (50324233242305).

The spelling of 20212121121103 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred three".