21403212303 has 8 divisors (see below), whose sum is σ = 31131945216. Its totient is φ = 12971643800.

The previous prime is 21403212277. The next prime is 21403212323. The reversal of 21403212303 is 30321230412.

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 21403212303 - 2¹³ = 21403204111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21403212303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403212323) 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, 324291063 + ... + 324291128.

It is an arithmetic number, because the mean of its divisors is an integer number (3891493152).

Almost surely, 2^21403212303 is an apocalyptic number.

21403212303 is a deficient number, since it is larger than the sum of its proper divisors (9728732913).

21403212303 is a wasteful number, since it uses less digits than its factorization.

21403212303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648582205.

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

Adding to 21403212303 its reverse (30321230412), we get a palindrome (51724442715).

The spelling of 21403212303 in words is "twenty-one billion, four hundred three million, two hundred twelve thousand, three hundred three".