23121020 has 48 divisors (see below), whose sum is σ = 55375488. Its totient is φ = 8033280.

The previous prime is 23121011. The next prime is 23121031. The reversal of 23121020 is 2012132.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 23120992 and 23121010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1805 + ... + 7035.

It is an arithmetic number, because the mean of its divisors is an integer number (1153656).

Almost surely, 2^23121020 is an apocalyptic number.

23121020 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 23121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27687744).

23121020 is an abundant number, since it is smaller than the sum of its proper divisors (32254468).

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

23121020 is a wasteful number, since it uses less digits than its factorization.

23121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270 (or 5268 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 23121020 is about 4808.4321769159. The cubic root of 23121020 is about 284.8846152390.

Adding to 23121020 its reverse (2012132), we get a palindrome (25133152).

The spelling of 23121020 in words is "twenty-three million, one hundred twenty-one thousand, twenty".