21004422554 has 8 divisors (see below), whose sum is σ = 31514544180. Its totient is φ = 10499574496.

The previous prime is 21004422521. The next prime is 21004422581. The reversal of 21004422554 is 45522440012.

It can be written as a sum of positive squares in 2 ways, for example, as 20746081225 + 258341329 = 144035^2 + 16073^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1308419 + ... + 1324374.

Almost surely, 2^21004422554 is an apocalyptic number.

21004422554 is a deficient number, since it is larger than the sum of its proper divisors (10510121626).

21004422554 is a wasteful number, since it uses less digits than its factorization.

21004422554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636784.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 21004422554 its reverse (45522440012), we get a palindrome (66526862566).

The spelling of 21004422554 in words is "twenty-one billion, four million, four hundred twenty-two thousand, five hundred fifty-four".