21344434221020 has 24 divisors (see below), whose sum is σ = 44823402628368. Its totient is φ = 8537756400000.

The previous prime is 21344434221017. The next prime is 21344434221083. The reversal of 21344434221020 is 2012243444312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14577395 + ... + 15974645.

It is an arithmetic number, because the mean of its divisors is an integer number (1867641776182).

Almost surely, 2^{21344434221020} is an apocalyptic number.

21344434221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344434221020 is an abundant number, since it is smaller than the sum of its proper divisors (23478968407348).

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

21344434221020 is a wasteful number, since it uses less digits than its factorization.

21344434221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161061 (or 2161059 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 21344434221020 its reverse (2012243444312), we get a palindrome (23356677665332).

The spelling of 21344434221020 in words is "twenty-one trillion, three hundred forty-four billion, four hundred thirty-four million, two hundred twenty-one thousand, twenty".