21421745303 has 8 divisors (see below), whose sum is σ = 24522734880. Its totient is φ = 18330940800.

The previous prime is 21421745281. The next prime is 21421745321. The reversal of 21421745303 is 30354712412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21421745303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21421745303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421745383) 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, 2541758 + ... + 2550171.

It is an arithmetic number, because the mean of its divisors is an integer number (3065341860).

Almost surely, 2^21421745303 is an apocalyptic number.

21421745303 is a deficient number, since it is larger than the sum of its proper divisors (3100989577).

21421745303 is an equidigital number, since it uses as much as digits as its factorization.

21421745303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5092537.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 21421745303 in words is "twenty-one billion, four hundred twenty-one million, seven hundred forty-five thousand, three hundred three".