21701764813 has 8 divisors (see below), whose sum is σ = 21808236800. Its totient is φ = 21595375008.

The previous prime is 21701764801. The next prime is 21701764853. The reversal of 21701764813 is 31846710712.

It is a happy number.

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 21701764813 - 2¹⁷ = 21701633741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701764853) by changing a digit.

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, 547033 + ... + 585361.

It is an arithmetic number, because the mean of its divisors is an integer number (2726029600).

Almost surely, 2^21701764813 is an apocalyptic number.

It is an amenable number.

21701764813 is a deficient number, since it is larger than the sum of its proper divisors (106471987).

21701764813 is a wasteful number, since it uses less digits than its factorization.

21701764813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41091.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 21701764813 in words is "twenty-one billion, seven hundred one million, seven hundred sixty-four thousand, eight hundred thirteen".