21823677 has 6 divisors (see below), whose sum is σ = 31523102. Its totient is φ = 14549112.

The previous prime is 21823663. The next prime is 21823679. The reversal of 21823677 is 77632812.

It can be written as a sum of positive squares in only one way, i.e., 21399876 + 423801 = 4626^2 + 651^2 .

It is not a de Polignac number, because 21823677 - 2¹¹ = 21821629 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 (21823679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1212418 + ... + 1212435.

Almost surely, 2^21823677 is an apocalyptic number.

It is an amenable number.

21823677 is a deficient number, since it is larger than the sum of its proper divisors (9699425).

21823677 is a wasteful number, since it uses less digits than its factorization.

21823677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424859 (or 2424856 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 21823677 is about 4671.5818520069. The cubic root of 21823677 is about 279.4533424421.

It can be divided in two parts, 21823 and 677, that added together give a square (22500 = 150²).

The spelling of 21823677 in words is "twenty-one million, eight hundred twenty-three thousand, six hundred seventy-seven".