21550444086 has 8 divisors (see below), whose sum is σ = 43100888184. Its totient is φ = 7183481360.

The previous prime is 21550444063. The next prime is 21550444103. The reversal of 21550444086 is 68044405512.

It is a happy number.

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

21550444086 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1795870335 + ... + 1795870346.

It is an arithmetic number, because the mean of its divisors is an integer number (5387611023).

Almost surely, 2^21550444086 is an apocalyptic number.

21550444086 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21550444086 is a wasteful number, since it uses less digits than its factorization.

21550444086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591740686.

The product of its (nonzero) digits is 153600, while the sum is 39.

Adding to 21550444086 its reverse (68044405512), we get a palindrome (89594849598).

The spelling of 21550444086 in words is "twenty-one billion, five hundred fifty million, four hundred forty-four thousand, eighty-six".