21553488687408 has 40 divisors (see below), whose sum is σ = 55680025963056. Its totient is φ = 7184472979200.

The previous prime is 21553488687373. The next prime is 21553488687539. The reversal of 21553488687408 is 80478688435512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20891878 + ... + 21899258.

Almost surely, 2^{21553488687408} is an apocalyptic number.

It is an amenable number.

21553488687408 is an abundant number, since it is smaller than the sum of its proper divisors (34126537275648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21553488687408 is a wasteful number, since it uses less digits than its factorization.

21553488687408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453133 (or 1453127 counting only the distinct ones).

The product of its (nonzero) digits is 412876800, while the sum is 69.

The spelling of 21553488687408 in words is "twenty-one trillion, five hundred fifty-three billion, four hundred eighty-eight million, six hundred eighty-seven thousand, four hundred eight".