21123301313112 has 32 divisors (see below), whose sum is σ = 54511745326080. Its totient is φ = 6813968165280.

The previous prime is 21123301313089. The next prime is 21123301313117. The reversal of 21123301313112 is 21131310332112.

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 (21123301313117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14195766268 + ... + 14195767755.

It is an arithmetic number, because the mean of its divisors is an integer number (1703492041440).

Almost surely, 2^{21123301313112} is an apocalyptic number.

It is an amenable number.

21123301313112 is an abundant number, since it is smaller than the sum of its proper divisors (33388444012968).

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

21123301313112 is a wasteful number, since it uses less digits than its factorization.

21123301313112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28391534063 (or 28391534059 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21123301313112 its reverse (21131310332112), we get a palindrome (42254611645224).

The spelling of 21123301313112 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred one million, three hundred thirteen thousand, one hundred twelve".