21682867007 has 4 divisors (see below), whose sum is σ = 21713450040. Its totient is φ = 21652283976.

The previous prime is 21682866977. The next prime is 21682867043. The reversal of 21682867007 is 70076828612.

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 21682867007 - 2¹⁸ = 21682604863 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 (21682567007) 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, 15290453 + ... + 15291870.

It is an arithmetic number, because the mean of its divisors is an integer number (5428362510).

Almost surely, 2^21682867007 is an apocalyptic number.

21682867007 is a deficient number, since it is larger than the sum of its proper divisors (30583033).

21682867007 is an equidigital number, since it uses as much as digits as its factorization.

21682867007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30583032.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 21682867007 in words is "twenty-one billion, six hundred eighty-two million, eight hundred sixty-seven thousand, seven".