20421043303 has 8 divisors (see below), whose sum is σ = 21126924000. Its totient is φ = 19715276448.

The previous prime is 20421043283. The next prime is 20421043319. The reversal of 20421043303 is 30334012402.

It is a happy number.

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 20421043303 - 2¹⁷ = 20420912231 is a prime.

It is a super-2 number, since 2×20421043303² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421043393) 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, 508425 + ... + 547117.

It is an arithmetic number, because the mean of its divisors is an integer number (2640865500).

Almost surely, 2^20421043303 is an apocalyptic number.

20421043303 is a deficient number, since it is larger than the sum of its proper divisors (705880697).

20421043303 is a wasteful number, since it uses less digits than its factorization.

20421043303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56921.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20421043303 its reverse (30334012402), we get a palindrome (50755055705).

The spelling of 20421043303 in words is "twenty billion, four hundred twenty-one million, forty-three thousand, three hundred three".