21550228403545 has 16 divisors (see below), whose sum is σ = 27667592642880. Its totient is φ = 16065053784000.

The previous prime is 21550228403531. The next prime is 21550228403563. The reversal of 21550228403545 is 54530482205512.

It is not a de Polignac number, because 21550228403545 - 2²³ = 21550220014937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21550228403495 and 21550228403504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1859375431 + ... + 1859387020.

It is an arithmetic number, because the mean of its divisors is an integer number (1729224540180).

Almost surely, 2^{21550228403545} is an apocalyptic number.

It is an amenable number.

21550228403545 is a deficient number, since it is larger than the sum of its proper divisors (6117364239335).

21550228403545 is a wasteful number, since it uses less digits than its factorization.

21550228403545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3718762536.

The product of its (nonzero) digits is 1920000, while the sum is 46.

The spelling of 21550228403545 in words is "twenty-one trillion, five hundred fifty billion, two hundred twenty-eight million, four hundred three thousand, five hundred forty-five".