20421313033021 has 8 divisors (see below), whose sum is σ = 20511456933024. Its totient is φ = 20331170731440.

The previous prime is 20421313032977. The next prime is 20421313033057. The reversal of 20421313033021 is 12033031312402.

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 20421313033021 - 2⁷ = 20421313032893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421313033621) 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, 30452466 + ... + 31115836.

It is an arithmetic number, because the mean of its divisors is an integer number (2563932116628).

Almost surely, 2^{20421313033021} is an apocalyptic number.

It is an amenable number.

20421313033021 is a deficient number, since it is larger than the sum of its proper divisors (90143900003).

20421313033021 is a wasteful number, since it uses less digits than its factorization.

20421313033021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799211.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 20421313033021 its reverse (12033031312402), we get a palindrome (32454344345423).

The spelling of 20421313033021 in words is "twenty trillion, four hundred twenty-one billion, three hundred thirteen million, thirty-three thousand, twenty-one".