21003403231 has 8 divisors (see below), whose sum is σ = 21402889200. Its totient is φ = 20604035712.

The previous prime is 21003403229. The next prime is 21003403237. The reversal of 21003403231 is 13230430012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21003403231 - 2¹ = 21003403229 is a prime.

It is a super-2 number, since 2×21003403231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003403199 and 21003403208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003403237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382311 + ... + 433783.

It is an arithmetic number, because the mean of its divisors is an integer number (2675361150).

Almost surely, 2^21003403231 is an apocalyptic number.

21003403231 is a deficient number, since it is larger than the sum of its proper divisors (399485969).

21003403231 is an equidigital number, since it uses as much as digits as its factorization.

21003403231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59225.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21003403231 its reverse (13230430012), we get a palindrome (34233833243).

The spelling of 21003403231 in words is "twenty-one billion, three million, four hundred three thousand, two hundred thirty-one".