21761023 has 8 divisors (see below), whose sum is σ = 23184000. Its totient is φ = 20365848.

The previous prime is 21761021. The next prime is 21761027. The reversal of 21761023 is 32016712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21761023 - 2¹ = 21761021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21760985 and 21761003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5323 + ... + 8476.

It is an arithmetic number, because the mean of its divisors is an integer number (2898000).

Almost surely, 2^21761023 is an apocalyptic number.

21761023 is a deficient number, since it is larger than the sum of its proper divisors (1422977).

21761023 is a wasteful number, since it uses less digits than its factorization.

21761023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13901.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21761023 is about 4664.8711664954. The cubic root of 21761023 is about 279.1856568453.

Adding to 21761023 its reverse (32016712), we get a palindrome (53777735).

The spelling of 21761023 in words is "twenty-one million, seven hundred sixty-one thousand, twenty-three".