21382064707 has 4 divisors (see below), whose sum is σ = 21394877680. Its totient is φ = 21369251736.

The previous prime is 21382064623. The next prime is 21382064719. The reversal of 21382064707 is 70746028312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21382064707 - 2⁷ = 21382064579 is a prime.

It is a super-2 number, since 2×21382064707² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21382064707.

It is not an unprimeable number, because it can be changed into a prime (21382064777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6403983 + ... + 6407320.

It is an arithmetic number, because the mean of its divisors is an integer number (5348719420).

Almost surely, 2^21382064707 is an apocalyptic number.

21382064707 is a deficient number, since it is larger than the sum of its proper divisors (12812973).

21382064707 is a wasteful number, since it uses less digits than its factorization.

21382064707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12812972.

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 21382064707 in words is "twenty-one billion, three hundred eighty-two million, sixty-four thousand, seven hundred seven".