23121000 has 192 divisors, whose sum is σ = 89556480. Its totient is φ = 5270400.

The previous prime is 23120989. The next prime is 23121011. The reversal of 23121000 is 12132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23120989) and next prime (23121011).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62817 + ... + 63183.

It is an arithmetic number, because the mean of its divisors is an integer number (466440).

Almost surely, 2^23121000 is an apocalyptic number.

23121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44778240).

23121000 is an abundant number, since it is smaller than the sum of its proper divisors (66435480).

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

23121000 is a wasteful number, since it uses less digits than its factorization.

23121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 23121000 is about 4808.4300972355. The cubic root of 23121000 is about 284.8845330960.

Adding to 23121000 its reverse (12132), we get a palindrome (23133132).

The spelling of 23121000 in words is "twenty-three million, one hundred twenty-one thousand".