21706470764 has 24 divisors (see below), whose sum is σ = 42559619088. Its totient is φ = 9599912640.

The previous prime is 21706470761. The next prime is 21706470767. The reversal of 21706470764 is 46707460712.

It is an interprime number because it is at equal distance from previous prime (21706470761) and next prime (21706470767).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (21706470761) 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, 6664979 + ... + 6668234.

It is an arithmetic number, because the mean of its divisors is an integer number (1773317462).

Almost surely, 2^21706470764 is an apocalyptic number.

It is an amenable number.

21706470764 is a deficient number, since it is larger than the sum of its proper divisors (20853148324).

21706470764 is a wasteful number, since it uses less digits than its factorization.

21706470764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13333265 (or 13333263 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 44.

The spelling of 21706470764 in words is "twenty-one billion, seven hundred six million, four hundred seventy thousand, seven hundred sixty-four".