21340375207 has 4 divisors (see below), whose sum is σ = 21341377816. Its totient is φ = 21339372600.

The previous prime is 21340375171. The next prime is 21340375219. The reversal of 21340375207 is 70257304312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21340375207 is a prime.

It is a super-2 number, since 2×21340375207² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340375607) 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, 468669 + ... + 512182.

It is an arithmetic number, because the mean of its divisors is an integer number (5335344454).

Almost surely, 2^21340375207 is an apocalyptic number.

21340375207 is a deficient number, since it is larger than the sum of its proper divisors (1002609).

21340375207 is an equidigital number, since it uses as much as digits as its factorization.

21340375207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002608.

The product of its (nonzero) digits is 35280, while the sum is 34.

Adding to 21340375207 its reverse (70257304312), we get a palindrome (91597679519).

The spelling of 21340375207 in words is "twenty-one billion, three hundred forty million, three hundred seventy-five thousand, two hundred seven".