21554040104 has 16 divisors (see below), whose sum is σ = 42791109300. Its totient is φ = 10143077632.

The previous prime is 21554040043. The next prime is 21554040113. The reversal of 21554040104 is 40104045512.

It can be written as a sum of positive squares in 2 ways, for example, as 20937511204 + 616528900 = 144698^2 + 24830^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79242659 + ... + 79242930.

Almost surely, 2^21554040104 is an apocalyptic number.

It is an amenable number.

21554040104 is a deficient number, since it is larger than the sum of its proper divisors (21237069196).

21554040104 is a wasteful number, since it uses less digits than its factorization.

21554040104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158485612 (or 158485608 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 21554040104 its reverse (40104045512), we get a palindrome (61658085616).

The spelling of 21554040104 in words is "twenty-one billion, five hundred fifty-four million, forty thousand, one hundred four".