21434021103 has 16 divisors (see below), whose sum is σ = 32532270336. Its totient is φ = 12425519040.

The previous prime is 21434021051. The next prime is 21434021111. The reversal of 21434021103 is 30112043412.

It is not a de Polignac number, because 21434021103 - 2⁹ = 21434020591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21434021103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434021113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14119150 + ... + 14120667.

It is an arithmetic number, because the mean of its divisors is an integer number (2033266896).

Almost surely, 2^21434021103 is an apocalyptic number.

21434021103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21434021103 is a deficient number, since it is larger than the sum of its proper divisors (11098249233).

21434021103 is a wasteful number, since it uses less digits than its factorization.

21434021103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28239854.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21434021103 its reverse (30112043412), we get a palindrome (51546064515).

The spelling of 21434021103 in words is "twenty-one billion, four hundred thirty-four million, twenty-one thousand, one hundred three".