203421443511 has 32 divisors (see below), whose sum is σ = 318686215680. Its totient is φ = 113787907200.

The previous prime is 203421443509. The next prime is 203421443569. The reversal of 203421443511 is 115344124302.

It is not a de Polignac number, because 203421443511 - 2¹ = 203421443509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203421447511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4033710 + ... + 4083828.

It is an arithmetic number, because the mean of its divisors is an integer number (9958944240).

Almost surely, 2^203421443511 is an apocalyptic number.

203421443511 is a deficient number, since it is larger than the sum of its proper divisors (115264772169).

203421443511 is a wasteful number, since it uses less digits than its factorization.

203421443511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59607.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 203421443511 its reverse (115344124302), we get a palindrome (318765567813).

The spelling of 203421443511 in words is "two hundred three billion, four hundred twenty-one million, four hundred forty-three thousand, five hundred eleven".