21443321221404 has 12 divisors (see below), whose sum is σ = 50034416183304. Its totient is φ = 7147773740464.

The previous prime is 21443321221391. The next prime is 21443321221451. The reversal of 21443321221404 is 40412212334412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893471717547 + ... + 893471717570.

It is an arithmetic number, because the mean of its divisors is an integer number (4169534681942).

Almost surely, 2^{21443321221404} is an apocalyptic number.

It is an amenable number.

21443321221404 is an abundant number, since it is smaller than the sum of its proper divisors (28591094961900).

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

21443321221404 is a wasteful number, since it uses less digits than its factorization.

21443321221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786943435124 (or 1786943435122 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 33.

Adding to 21443321221404 its reverse (40412212334412), we get a palindrome (61855533555816).

The spelling of 21443321221404 in words is "twenty-one trillion, four hundred forty-three billion, three hundred twenty-one million, two hundred twenty-one thousand, four hundred four".