21340677 has 4 divisors (see below), whose sum is σ = 28454240. Its totient is φ = 14227116.

The previous prime is 21340663. The next prime is 21340721. The reversal of 21340677 is 77604312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21340677 - 2⁸ = 21340421 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 (21340637) 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, 3556777 + ... + 3556782.

It is an arithmetic number, because the mean of its divisors is an integer number (7113560).

Almost surely, 2^21340677 is an apocalyptic number.

It is an amenable number.

21340677 is a deficient number, since it is larger than the sum of its proper divisors (7113563).

21340677 is an equidigital number, since it uses as much as digits as its factorization.

21340677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7113562.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 21340677 is about 4619.5970603506. The cubic root of 21340677 is about 277.3763299273.

Adding to 21340677 its reverse (77604312), we get a palindrome (98944989).

The spelling of 21340677 in words is "twenty-one million, three hundred forty thousand, six hundred seventy-seven".