21206646014 has 16 divisors (see below), whose sum is σ = 32081631120. Its totient is φ = 10512914880.

The previous prime is 21206646011. The next prime is 21206646017. The reversal of 21206646014 is 41064660212.

21206646014 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (21206646011) and next prime (21206646017).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21206646011) 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, 259952 + ... + 331644.

It is an arithmetic number, because the mean of its divisors is an integer number (2005101945).

Almost surely, 2^21206646014 is an apocalyptic number.

21206646014 is a deficient number, since it is larger than the sum of its proper divisors (10874985106).

21206646014 is a wasteful number, since it uses less digits than its factorization.

21206646014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72955.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 21206646014 in words is "twenty-one billion, two hundred six million, six hundred forty-six thousand, fourteen".