21054440410 has 16 divisors (see below), whose sum is σ = 38922263496. Its totient is φ = 8194160448.

The previous prime is 21054440401. The next prime is 21054440411. The reversal of 21054440410 is 1404445012.

It can be written as a sum of positive squares in 4 ways, for example, as 21051978649 + 2461761 = 145093^2 + 1569^2 .

It is not an unprimeable number, because it can be changed into a prime (21054440411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28451577 + ... + 28452316.

Almost surely, 2^21054440410 is an apocalyptic number.

21054440410 is a deficient number, since it is larger than the sum of its proper divisors (17867823086).

21054440410 is a wasteful number, since it uses less digits than its factorization.

21054440410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56903937.

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 21054440410 its reverse (1404445012), we get a palindrome (22458885422).

The spelling of 21054440410 in words is "twenty-one billion, fifty-four million, four hundred forty thousand, four hundred ten".