23121630 has 120 divisors (see below), whose sum is σ = 70786872. Its totient is φ = 5235552.

The previous prime is 23121617. The next prime is 23121643. The reversal of 23121630 is 3612132.

23121630 is a `hidden beast` number, since 2 + 31 + 2 + 1 + 630 = 666.

It is an interprime number because it is at equal distance from previous prime (23121617) and next prime (23121643).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 216037 + ... + 216143.

Almost surely, 2^23121630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23121630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35393436).

23121630 is an abundant number, since it is smaller than the sum of its proper divisors (47665242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23121630 is a wasteful number, since it uses less digits than its factorization.

23121630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 23121630 is about 4808.4956067361. The cubic root of 23121630 is about 284.8871205796.

Adding to 23121630 its reverse (3612132), we get a palindrome (26733762).

The spelling of 23121630 in words is "twenty-three million, one hundred twenty-one thousand, six hundred thirty".