21134012403 has 16 divisors (see below), whose sum is σ = 32811837696. Its totient is φ = 11848717920.

The previous prime is 21134012401. The next prime is 21134012521. The reversal of 21134012403 is 30421043112.

It is not a de Polignac number, because 21134012403 - 2¹ = 21134012401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21134012403.

It is not an unprimeable number, because it can be changed into a prime (21134012401) 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, 9493053 + ... + 9495278.

It is an arithmetic number, because the mean of its divisors is an integer number (2050739856).

Almost surely, 2^21134012403 is an apocalyptic number.

21134012403 is a deficient number, since it is larger than the sum of its proper divisors (11677825293).

21134012403 is a wasteful number, since it uses less digits than its factorization.

21134012403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18988394.

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

Adding to 21134012403 its reverse (30421043112), we get a palindrome (51555055515).

The spelling of 21134012403 in words is "twenty-one billion, one hundred thirty-four million, twelve thousand, four hundred three".