21918204094 has 8 divisors (see below), whose sum is σ = 33196503600. Its totient is φ = 10852702896.

The previous prime is 21918204037. The next prime is 21918204101. The reversal of 21918204094 is 49040281912.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53199319 + ... + 53199730.

It is an arithmetic number, because the mean of its divisors is an integer number (4149562950).

Almost surely, 2^21918204094 is an apocalyptic number.

21918204094 is a deficient number, since it is larger than the sum of its proper divisors (11278299506).

21918204094 is a wasteful number, since it uses less digits than its factorization.

21918204094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106399154.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 21918204094 in words is "twenty-one billion, nine hundred eighteen million, two hundred four thousand, ninety-four".