21005618714 has 8 divisors (see below), whose sum is σ = 31510049760. Its totient is φ = 10502268796.

The previous prime is 21005618681. The next prime is 21005618719. The reversal of 21005618714 is 41781650012.

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

It is not an unprimeable number, because it can be changed into a prime (21005618719) 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 3 ways as a sum of consecutive naturals, for example, 219824 + ... + 300555.

It is an arithmetic number, because the mean of its divisors is an integer number (3938756220).

Almost surely, 2^21005618714 is an apocalyptic number.

21005618714 is a deficient number, since it is larger than the sum of its proper divisors (10504431046).

21005618714 is a wasteful number, since it uses less digits than its factorization.

21005618714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540564.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 21005618714 in words is "twenty-one billion, five million, six hundred eighteen thousand, seven hundred fourteen".