21550387199 has 8 divisors (see below), whose sum is σ = 23512023120. Its totient is φ = 19589169600.

The previous prime is 21550387193. The next prime is 21550387213. The reversal of 21550387199 is 99178305512.

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

It is a de Polignac number, because none of the positive numbers 2^k-21550387199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550387193) 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, 8459 + ... + 207779.

It is an arithmetic number, because the mean of its divisors is an integer number (2939002890).

Almost surely, 2^21550387199 is an apocalyptic number.

21550387199 is a deficient number, since it is larger than the sum of its proper divisors (1961635921).

21550387199 is a wasteful number, since it uses less digits than its factorization.

21550387199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209161.

The product of its (nonzero) digits is 680400, while the sum is 50.

The spelling of 21550387199 in words is "twenty-one billion, five hundred fifty million, three hundred eighty-seven thousand, one hundred ninety-nine".