21550055168859 has 8 divisors (see below), whose sum is σ = 32838179304960. Its totient is φ = 12314317239336.

The previous prime is 21550055168857. The next prime is 21550055168909. The reversal of 21550055168859 is 95886155005512.

It is a happy number.

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

It is not a de Polignac number, because 21550055168859 - 2¹ = 21550055168857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21550055168857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513096551619 + ... + 513096551660.

It is an arithmetic number, because the mean of its divisors is an integer number (4104772413120).

Almost surely, 2^{21550055168859} is an apocalyptic number.

21550055168859 is a deficient number, since it is larger than the sum of its proper divisors (11288124136101).

21550055168859 is a wasteful number, since it uses less digits than its factorization.

21550055168859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026193103289.

The product of its (nonzero) digits is 21600000, while the sum is 60.

The spelling of 21550055168859 in words is "twenty-one trillion, five hundred fifty billion, fifty-five million, one hundred sixty-eight thousand, eight hundred fifty-nine".