21301220144000 has 64 divisors (see below), whose sum is σ = 52960158622800. Its totient is φ = 8520488051200.

The previous prime is 21301220143919. The next prime is 21301220144059. The reversal of 21301220144000 is 44102210312.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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, 665647130 + ... + 665679129.

Almost surely, 2^{21301220144000} is an apocalyptic number.

21301220144000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21301220144000 is an abundant number, since it is smaller than the sum of its proper divisors (31658938478800).

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

21301220144000 is an equidigital number, since it uses as much as digits as its factorization.

21301220144000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331326288 (or 1331326266 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21301220144000 its reverse (44102210312), we get a palindrome (21345322354312).

The spelling of 21301220144000 in words is "twenty-one trillion, three hundred one billion, two hundred twenty million, one hundred forty-four thousand".