21904212827 has 8 divisors (see below), whose sum is σ = 25046352096. Its totient is φ = 18765315072.

The previous prime is 21904212823. The next prime is 21904212881. The reversal of 21904212827 is 72821240912.

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

It is not a de Polignac number, because 21904212827 - 2² = 21904212823 is a prime.

It is a super-2 number, since 2×21904212827² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21904212823) 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 7 ways as a sum of consecutive naturals, for example, 795878 + ... + 822939.

It is an arithmetic number, because the mean of its divisors is an integer number (3130794012).

Almost surely, 2^21904212827 is an apocalyptic number.

21904212827 is a deficient number, since it is larger than the sum of its proper divisors (3142139269).

21904212827 is a wasteful number, since it uses less digits than its factorization.

21904212827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620757.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 21904212827 in words is "twenty-one billion, nine hundred four million, two hundred twelve thousand, eight hundred twenty-seven".