21431120403 has 32 divisors (see below), whose sum is σ = 35639009280. Its totient is φ = 11128908960.

The previous prime is 21431120383. The next prime is 21431120443. The reversal of 21431120403 is 30402113412.

It is not a de Polignac number, because 21431120403 - 2⁶ = 21431120339 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 21431120403.

It is not an unprimeable number, because it can be changed into a prime (21431120443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 663126 + ... + 694692.

It is an arithmetic number, because the mean of its divisors is an integer number (1113719040).

Almost surely, 2^21431120403 is an apocalyptic number.

21431120403 is a deficient number, since it is larger than the sum of its proper divisors (14207888877).

21431120403 is a wasteful number, since it uses less digits than its factorization.

21431120403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34527.

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

Adding to 21431120403 its reverse (30402113412), we get a palindrome (51833233815).

The spelling of 21431120403 in words is "twenty-one billion, four hundred thirty-one million, one hundred twenty thousand, four hundred three".