203121042420011 has 4 divisors (see below), whose sum is σ = 203761802806512. Its totient is φ = 202480282033512.

The previous prime is 203121042419987. The next prime is 203121042420059. The reversal of 203121042420011 is 110024240121302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203121042420011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203121042420061) 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, 320380192775 + ... + 320380193408.

It is an arithmetic number, because the mean of its divisors is an integer number (50940450701628).

Almost surely, 2^{203121042420011} is an apocalyptic number.

203121042420011 is a deficient number, since it is larger than the sum of its proper divisors (640760386501).

203121042420011 is an equidigital number, since it uses as much as digits as its factorization.

203121042420011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640760386500.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 203121042420011 its reverse (110024240121302), we get a palindrome (313145282541313).

The spelling of 203121042420011 in words is "two hundred three trillion, one hundred twenty-one billion, forty-two million, four hundred twenty thousand, eleven".