21493255827 has 8 divisors (see below), whose sum is σ = 28687749264. Its totient is φ = 14313799808.

The previous prime is 21493255741. The next prime is 21493255853. The reversal of 21493255827 is 72855239412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21493255827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21493255127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3756018 + ... + 3761735.

It is an arithmetic number, because the mean of its divisors is an integer number (3585968658).

Almost surely, 2^21493255827 is an apocalyptic number.

21493255827 is a deficient number, since it is larger than the sum of its proper divisors (7194493437).

21493255827 is an equidigital number, since it uses as much as digits as its factorization.

21493255827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7518709.

The product of its digits is 1209600, while the sum is 48.

The spelling of 21493255827 in words is "twenty-one billion, four hundred ninety-three million, two hundred fifty-five thousand, eight hundred twenty-seven".