20421505434326 has 8 divisors (see below), whose sum is σ = 30632277578400. Its totient is φ = 10210746241528.

The previous prime is 20421505434311. The next prime is 20421505434361. The reversal of 20421505434326 is 62343450512402.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3551180 + ... + 7311216.

It is an arithmetic number, because the mean of its divisors is an integer number (3829034697300).

Almost surely, 2^{20421505434326} is an apocalyptic number.

20421505434326 is a deficient number, since it is larger than the sum of its proper divisors (10210772144074).

20421505434326 is a wasteful number, since it uses less digits than its factorization.

20421505434326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6475638.

The product of its (nonzero) digits is 691200, while the sum is 41.

Adding to 20421505434326 its reverse (62343450512402), we get a palindrome (82764955946728).

The spelling of 20421505434326 in words is "twenty trillion, four hundred twenty-one billion, five hundred five million, four hundred thirty-four thousand, three hundred twenty-six".