21308814427 has 8 divisors (see below), whose sum is σ = 21500762976. Its totient is φ = 21116925312.

The previous prime is 21308814419. The next prime is 21308814467. The reversal of 21308814427 is 72441880312.

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 21308814427 - 2³ = 21308814419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21308814427.

It is not an unprimeable number, because it can be changed into a prime (21308814467) 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, 1038138 + ... + 1058464.

It is an arithmetic number, because the mean of its divisors is an integer number (2687595372).

Almost surely, 2^21308814427 is an apocalyptic number.

21308814427 is a deficient number, since it is larger than the sum of its proper divisors (191948549).

21308814427 is a wasteful number, since it uses less digits than its factorization.

21308814427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29717.

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 21308814427 in words is "twenty-one billion, three hundred eight million, eight hundred fourteen thousand, four hundred twenty-seven".