23121647 has 8 divisors (see below), whose sum is σ = 24468480. Its totient is φ = 21803320.

The previous prime is 23121643. The next prime is 23121661. The reversal of 23121647 is 74612132.

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 23121647 - 2² = 23121643 is a prime.

It is a super-2 number, since 2×23121647² = 1069221119985218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121643) 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, 5447 + ... + 8712.

It is an arithmetic number, because the mean of its divisors is an integer number (3058560).

Almost surely, 2^23121647 is an apocalyptic number.

23121647 is a deficient number, since it is larger than the sum of its proper divisors (1346833).

23121647 is a wasteful number, since it uses less digits than its factorization.

23121647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14253.

The product of its digits is 2016, while the sum is 26.

The square root of 23121647 is about 4808.4973744404. The cubic root of 23121647 is about 284.8871903999.

Adding to 23121647 its reverse (74612132), we get a palindrome (97733779).

The spelling of 23121647 in words is "twenty-three million, one hundred twenty-one thousand, six hundred forty-seven".