21308405014 has 16 divisors (see below), whose sum is σ = 34430195520. Its totient is φ = 9832098240.

The previous prime is 21308405003. The next prime is 21308405021. The reversal of 21308405014 is 41050480312.

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 7 ways as a sum of consecutive naturals, for example, 2142 + ... + 206449.

It is an arithmetic number, because the mean of its divisors is an integer number (2151887220).

Almost surely, 2^21308405014 is an apocalyptic number.

21308405014 is a deficient number, since it is larger than the sum of its proper divisors (13121790506).

21308405014 is a wasteful number, since it uses less digits than its factorization.

21308405014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212535.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 21308405014 its reverse (41050480312), we get a palindrome (62358885326).

The spelling of 21308405014 in words is "twenty-one billion, three hundred eight million, four hundred five thousand, fourteen".