23121213112 has 64 divisors (see below), whose sum is σ = 45023040000. Its totient is φ = 11124407424.

The previous prime is 23121213109. The next prime is 23121213121. The reversal of 23121213112 is 21131212132.

It is a self number, because there is not a number n which added to its sum of digits gives 23121213112.

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, 14983813 + ... + 14985355.

It is an arithmetic number, because the mean of its divisors is an integer number (703485000).

Almost surely, 2^23121213112 is an apocalyptic number.

It is an amenable number.

23121213112 is a deficient number, since it is larger than the sum of its proper divisors (21901826888).

23121213112 is a wasteful number, since it uses less digits than its factorization.

23121213112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260 (or 2256 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 23121213112 its reverse (21131212132), we get a palindrome (44252425244).

The spelling of 23121213112 in words is "twenty-three billion, one hundred twenty-one million, two hundred thirteen thousand, one hundred twelve".