21550618341 has 12 divisors (see below), whose sum is σ = 35575624032. Its totient is φ = 12314639016.

The previous prime is 21550618333. The next prime is 21550618351. The reversal of 21550618341 is 14381605512.

21550618341 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 0 + 618 + 34 + 1 = 666.

It is not a de Polignac number, because 21550618341 - 2³ = 21550618333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21550618296 and 21550618305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550618351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171036591 + ... + 171036716.

It is an arithmetic number, because the mean of its divisors is an integer number (2964635336).

Almost surely, 2^21550618341 is an apocalyptic number.

21550618341 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21550618341 is a deficient number, since it is larger than the sum of its proper divisors (14025005691).

21550618341 is a wasteful number, since it uses less digits than its factorization.

21550618341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342073320 (or 342073317 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 21550618341 in words is "twenty-one billion, five hundred fifty million, six hundred eighteen thousand, three hundred forty-one".