21550395085 has 8 divisors (see below), whose sum is σ = 26694683136. Its totient is φ = 16684176720.

The previous prime is 21550395079. The next prime is 21550395101. The reversal of 21550395085 is 58059305512.

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

It is not a de Polignac number, because 21550395085 - 2²¹ = 21548297933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69517249 + ... + 69517558.

It is an arithmetic number, because the mean of its divisors is an integer number (3336835392).

Almost surely, 2^21550395085 is an apocalyptic number.

It is an amenable number.

21550395085 is a deficient number, since it is larger than the sum of its proper divisors (5144288051).

21550395085 is a wasteful number, since it uses less digits than its factorization.

21550395085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139034843.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 21550395085 in words is "twenty-one billion, five hundred fifty million, three hundred ninety-five thousand, eighty-five".