21866674049 has 4 divisors (see below), whose sum is σ = 23854553520. Its totient is φ = 19878794580.

The previous prime is 21866674003. The next prime is 21866674117. The reversal of 21866674049 is 94047666812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21866674049 - 2²⁸ = 21598238593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21866674549) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 993939719 + ... + 993939740.

It is an arithmetic number, because the mean of its divisors is an integer number (5963638380).

Almost surely, 2^21866674049 is an apocalyptic number.

It is an amenable number.

21866674049 is a deficient number, since it is larger than the sum of its proper divisors (1987879471).

21866674049 is a wasteful number, since it uses less digits than its factorization.

21866674049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987879470.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 21866674049 in words is "twenty-one billion, eight hundred sixty-six million, six hundred seventy-four thousand, forty-nine".