23121631 has 8 divisors (see below), whose sum is σ = 25092144. Its totient is φ = 21178560.

The previous prime is 23121617. The next prime is 23121643. The reversal of 23121631 is 13612132.

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

It is not a de Polignac number, because 23121631 - 2¹⁷ = 22990559 is a prime.

It is a super-2 number, since 2×23121631² = 1069219640200322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23121599 and 23121608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121661) 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, 5086 + ... + 8491.

It is an arithmetic number, because the mean of its divisors is an integer number (3136518).

Almost surely, 2^23121631 is an apocalyptic number.

23121631 is a deficient number, since it is larger than the sum of its proper divisors (1970513).

23121631 is a wasteful number, since it uses less digits than its factorization.

23121631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13721.

The product of its digits is 216, while the sum is 19.

The square root of 23121631 is about 4808.4957107187. The cubic root of 23121631 is about 284.8871246867.

Adding to 23121631 its reverse (13612132), we get a palindrome (36733763).

The spelling of 23121631 in words is "twenty-three million, one hundred twenty-one thousand, six hundred thirty-one".