21431202303 has 32 divisors (see below), whose sum is σ = 35164177920. Its totient is φ = 11330657280.

The previous prime is 21431202301. The next prime is 21431202319. The reversal of 21431202303 is 30320213412.

It is not a de Polignac number, because 21431202303 - 2¹ = 21431202301 is a prime.

It is a super-2 number, since 2×21431202303² (a number of 21 digits) contains 22 as substring.

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 21431202303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431202301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487678 + ... + 529803.

It is an arithmetic number, because the mean of its divisors is an integer number (1098880560).

Almost surely, 2^21431202303 is an apocalyptic number.

21431202303 is a deficient number, since it is larger than the sum of its proper divisors (13732975617).

21431202303 is a wasteful number, since it uses less digits than its factorization.

21431202303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017567.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21431202303 its reverse (30320213412), we get a palindrome (51751415715).

The spelling of 21431202303 in words is "twenty-one billion, four hundred thirty-one million, two hundred two thousand, three hundred three".