23121210552 has 128 divisors (see below), whose sum is σ = 66319810560. Its totient is φ = 6648808320.

The previous prime is 23121210551. The next prime is 23121210559. The reversal of 23121210552 is 25501212132.

It is a super-2 number, since 2×23121210552² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121210551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 756153 + ... + 786135.

It is an arithmetic number, because the mean of its divisors is an integer number (518123520).

Almost surely, 2^23121210552 is an apocalyptic number.

23121210552 is a gapful number since it is divisible by the number (22) 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 23121210552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33159905280).

23121210552 is an abundant number, since it is smaller than the sum of its proper divisors (43198600008).

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

23121210552 is a wasteful number, since it uses less digits than its factorization.

23121210552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30153 (or 30149 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 23121210552 its reverse (25501212132), we get a palindrome (48622422684).

The spelling of 23121210552 in words is "twenty-three billion, one hundred twenty-one million, two hundred ten thousand, five hundred fifty-two".