21421434504344 has 32 divisors (see below), whose sum is σ = 45903411160320. Its totient is φ = 9180547343136.

The previous prime is 21421434504257. The next prime is 21421434504347. The reversal of 21421434504344 is 44340543412412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421434504347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6699437 + ... + 9366179.

It is an arithmetic number, because the mean of its divisors is an integer number (1434481598760).

Almost surely, 2^{21421434504344} is an apocalyptic number.

It is an amenable number.

21421434504344 is an abundant number, since it is smaller than the sum of its proper divisors (24481976655976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21421434504344 is a wasteful number, since it uses less digits than its factorization.

21421434504344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810199 (or 2810195 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 41.

Adding to 21421434504344 its reverse (44340543412412), we get a palindrome (65761977916756).

The spelling of 21421434504344 in words is "twenty-one trillion, four hundred twenty-one billion, four hundred thirty-four million, five hundred four thousand, three hundred forty-four".