203426421511 has 4 divisors (see below), whose sum is σ = 203949369000. Its totient is φ = 202903474024.

The previous prime is 203426421449. The next prime is 203426421563. The reversal of 203426421511 is 115124624302.

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 203426421511 - 2⁹ = 203426420999 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 (203426424511) 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, 261473161 + ... + 261473938.

It is an arithmetic number, because the mean of its divisors is an integer number (50987342250).

Almost surely, 2^203426421511 is an apocalyptic number.

203426421511 is a deficient number, since it is larger than the sum of its proper divisors (522947489).

203426421511 is an equidigital number, since it uses as much as digits as its factorization.

203426421511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522947488.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 203426421511 in words is "two hundred three billion, four hundred twenty-six million, four hundred twenty-one thousand, five hundred eleven".