21574097905 has 8 divisors (see below), whose sum is σ = 26043941952. Its totient is φ = 17155928688.

The previous prime is 21574097837. The next prime is 21574097939. The reversal of 21574097905 is 50979047512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21574097905 - 2²¹ = 21572000753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12917787 + ... + 12919456.

It is an arithmetic number, because the mean of its divisors is an integer number (3255492744).

Almost surely, 2^21574097905 is an apocalyptic number.

It is an amenable number.

21574097905 is a deficient number, since it is larger than the sum of its proper divisors (4469844047).

21574097905 is a wasteful number, since it uses less digits than its factorization.

21574097905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25837415.

The product of its (nonzero) digits is 793800, while the sum is 49.

The spelling of 21574097905 in words is "twenty-one billion, five hundred seventy-four million, ninety-seven thousand, nine hundred five".