21550530105 has 24 divisors (see below), whose sum is σ = 40227657288. Its totient is φ = 10609491456.

The previous prime is 21550530073. The next prime is 21550530137. The reversal of 21550530105 is 50103505512.

21550530105 is a `hidden beast` number, since 2 + 1 + 550 + 5 + 3 + 0 + 105 = 666.

It is an interprime number because it is at equal distance from previous prime (21550530073) and next prime (21550530137).

It can be written as a sum of positive squares in 4 ways, for example, as 1608571449 + 19941958656 = 40107^2 + 141216^2 .

It is not a de Polignac number, because 21550530105 - 2⁵ = 21550530073 is a prime.

It is a super-2 number, since 2×21550530105² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18418672 + ... + 18419841.

It is an arithmetic number, because the mean of its divisors is an integer number (1676152387).

Almost surely, 2^21550530105 is an apocalyptic number.

It is an amenable number.

21550530105 is a deficient number, since it is larger than the sum of its proper divisors (18677127183).

21550530105 is a wasteful number, since it uses less digits than its factorization.

21550530105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36838537 (or 36838534 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The spelling of 21550530105 in words is "twenty-one billion, five hundred fifty million, five hundred thirty thousand, one hundred five".