21440134343012 has 96 divisors (see below), whose sum is σ = 48814649339904. Its totient is φ = 7989731164800.

The previous prime is 21440134342933. The next prime is 21440134343051. The reversal of 21440134343012 is 21034343104412.

It is a self number, because there is not a number n which added to its sum of digits gives 21440134343012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180320462 + ... + 180439322.

It is an arithmetic number, because the mean of its divisors is an integer number (508485930624).

Almost surely, 2^{21440134343012} is an apocalyptic number.

21440134343012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21440134343012 is an abundant number, since it is smaller than the sum of its proper divisors (27374514996892).

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

21440134343012 is a wasteful number, since it uses less digits than its factorization.

21440134343012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144369 (or 144367 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21440134343012 its reverse (21034343104412), we get a palindrome (42474477447424).

The spelling of 21440134343012 in words is "twenty-one trillion, four hundred forty billion, one hundred thirty-four million, three hundred forty-three thousand, twelve".