21798677 has 4 divisors (see below), whose sum is σ = 21929376. Its totient is φ = 21667980.

The previous prime is 21798653. The next prime is 21798683. The reversal of 21798677 is 77689712.

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 a cyclic number.

It is not a de Polignac number, because 21798677 - 2⁶ = 21798613 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 (21798697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65099 + ... + 65432.

It is an arithmetic number, because the mean of its divisors is an integer number (5482344).

Almost surely, 2^21798677 is an apocalyptic number.

It is an amenable number.

21798677 is a deficient number, since it is larger than the sum of its proper divisors (130699).

21798677 is a wasteful number, since it uses less digits than its factorization.

21798677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130698.

The product of its digits is 296352, while the sum is 47.

The square root of 21798677 is about 4668.9053320880. The cubic root of 21798677 is about 279.3465928939.

The spelling of 21798677 in words is "twenty-one million, seven hundred ninety-eight thousand, six hundred seventy-seven".