21321040403 has 8 divisors (see below), whose sum is σ = 22962936528. Its totient is φ = 19679403744.

The previous prime is 21321040397. The next prime is 21321040409. The reversal of 21321040403 is 30404012312.

It is an interprime number because it is at equal distance from previous prime (21321040397) and next prime (21321040409).

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

It is not a de Polignac number, because 21321040403 - 2⁴ = 21321040387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321040409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126800 + ... + 242322.

It is an arithmetic number, because the mean of its divisors is an integer number (2870367066).

Almost surely, 2^21321040403 is an apocalyptic number.

21321040403 is a deficient number, since it is larger than the sum of its proper divisors (1641896125).

21321040403 is a wasteful number, since it uses less digits than its factorization.

21321040403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129733.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21321040403 its reverse (30404012312), we get a palindrome (51725052715).

The spelling of 21321040403 in words is "twenty-one billion, three hundred twenty-one million, forty thousand, four hundred three".