21914605 has 4 divisors (see below), whose sum is σ = 26297532. Its totient is φ = 17531680.

The previous prime is 21914603. The next prime is 21914609. The reversal of 21914605 is 50641912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10259209 + 11655396 = 3203^2 + 3414^2 .

It is not a de Polignac number, because 21914605 - 2¹ = 21914603 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 (21914603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2191456 + ... + 2191465.

It is an arithmetic number, because the mean of its divisors is an integer number (6574383).

Almost surely, 2^21914605 is an apocalyptic number.

It is an amenable number.

21914605 is a deficient number, since it is larger than the sum of its proper divisors (4382927).

21914605 is an equidigital number, since it uses as much as digits as its factorization.

21914605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382926.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21914605 is about 4681.3037713868. The cubic root of 21914605 is about 279.8409172869.

The spelling of 21914605 in words is "twenty-one million, nine hundred fourteen thousand, six hundred five".