21134321403344 has 20 divisors (see below), whose sum is σ = 40948280051940. Its totient is φ = 10567023325440.

The previous prime is 21134321403319. The next prime is 21134321403347. The reversal of 21134321403344 is 44330412343112.

It can be written as a sum of positive squares in 2 ways, for example, as 15580229952400 + 5554091450944 = 3947180^2 + 2356712^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134321403347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7311077 + ... + 9783684.

It is an arithmetic number, because the mean of its divisors is an integer number (2047414002597).

Almost surely, 2^{21134321403344} is an apocalyptic number.

It is an amenable number.

21134321403344 is a deficient number, since it is larger than the sum of its proper divisors (19813958648596).

21134321403344 is a wasteful number, since it uses less digits than its factorization.

21134321403344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17172038 (or 17172032 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 21134321403344 its reverse (44330412343112), we get a palindrome (65464733746456).

The spelling of 21134321403344 in words is "twenty-one trillion, one hundred thirty-four billion, three hundred twenty-one million, four hundred three thousand, three hundred forty-four".