21344134544 has 10 divisors (see below), whose sum is σ = 41354260710. Its totient is φ = 10672067264.

The previous prime is 21344134517. The next prime is 21344134547. The reversal of 21344134544 is 44543144312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20245874944 + 1098259600 = 142288^2 + 33140^2 .

It is not an unprimeable number, because it can be changed into a prime (21344134547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 667004189 + ... + 667004220.

It is an arithmetic number, because the mean of its divisors is an integer number (4135426071).

Almost surely, 2^21344134544 is an apocalyptic number.

It is an amenable number.

21344134544 is a deficient number, since it is larger than the sum of its proper divisors (20010126166).

21344134544 is a wasteful number, since it uses less digits than its factorization.

21344134544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334008417 (or 1334008411 counting only the distinct ones).

The product of its digits is 92160, while the sum is 35.

Adding to 21344134544 its reverse (44543144312), we get a palindrome (65887278856).

The spelling of 21344134544 in words is "twenty-one billion, three hundred forty-four million, one hundred thirty-four thousand, five hundred forty-four".