21963105 has 12 divisors (see below), whose sum is σ = 38069460. Its totient is φ = 11713632.

The previous prime is 21963103. The next prime is 21963119. The reversal of 21963105 is 50136912.

21963105 is a `hidden beast` number, since 21 + 9 + 631 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4524129 + 17438976 = 2127^2 + 4176^2 .

It is not a de Polignac number, because 21963105 - 2¹ = 21963103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21963103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243990 + ... + 244079.

It is an arithmetic number, because the mean of its divisors is an integer number (3172455).

Almost surely, 2^21963105 is an apocalyptic number.

It is an amenable number.

21963105 is a deficient number, since it is larger than the sum of its proper divisors (16106355).

21963105 is a wasteful number, since it uses less digits than its factorization.

21963105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488080 (or 488077 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 21963105 is about 4686.4810892609. The cubic root of 21963105 is about 280.0472071766.

The spelling of 21963105 in words is "twenty-one million, nine hundred sixty-three thousand, one hundred five".