21164665614 has 32 divisors (see below), whose sum is σ = 43057923840. Its totient is φ = 6933518592.

The previous prime is 21164665597. The next prime is 21164665651. The reversal of 21164665614 is 41656646112.

It is a happy number.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 2613079 + ... + 2621165.

It is an arithmetic number, because the mean of its divisors is an integer number (1345560120).

Almost surely, 2^21164665614 is an apocalyptic number.

21164665614 is an abundant number, since it is smaller than the sum of its proper divisors (21893258226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21164665614 is a wasteful number, since it uses less digits than its factorization.

21164665614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15544.

The product of its digits is 207360, while the sum is 42.

The spelling of 21164665614 in words is "twenty-one billion, one hundred sixty-four million, six hundred sixty-five thousand, six hundred fourteen".