21343677 has 12 divisors (see below), whose sum is σ = 28756224. Its totient is φ = 14081280.

The previous prime is 21343661. The next prime is 21343691. The reversal of 21343677 is 77634312.

It is not a de Polignac number, because 21343677 - 2⁴ = 21343661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110493 + ... + 110685.

It is an arithmetic number, because the mean of its divisors is an integer number (2396352).

Almost surely, 2^21343677 is an apocalyptic number.

It is an amenable number.

21343677 is a deficient number, since it is larger than the sum of its proper divisors (7412547).

21343677 is an equidigital number, since it uses as much as digits as its factorization.

21343677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580 (or 387 counting only the distinct ones).

The product of its digits is 21168, while the sum is 33.

The square root of 21343677 is about 4619.9217525841. The cubic root of 21343677 is about 277.3893268596.

Adding to 21343677 its reverse (77634312), we get a palindrome (98977989).

The spelling of 21343677 in words is "twenty-one million, three hundred forty-three thousand, six hundred seventy-seven".