21034344544 has 12 divisors (see below), whose sum is σ = 41411365884. Its totient is φ = 10517172256.

The previous prime is 21034344523. The next prime is 21034344577. The reversal of 21034344544 is 44544343012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328661602 + ... + 328661665.

It is an arithmetic number, because the mean of its divisors is an integer number (3450947157).

Almost surely, 2^21034344544 is an apocalyptic number.

It is an amenable number.

21034344544 is a deficient number, since it is larger than the sum of its proper divisors (20377021340).

21034344544 is an equidigital number, since it uses as much as digits as its factorization.

21034344544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657323277 (or 657323269 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 34.

Adding to 21034344544 its reverse (44544343012), we get a palindrome (65578687556).

The spelling of 21034344544 in words is "twenty-one billion, thirty-four million, three hundred forty-four thousand, five hundred forty-four".