21123003201312 has 96 divisors (see below), whose sum is σ = 57208907327040. Its totient is φ = 6819849953280.

The previous prime is 21123003201277. The next prime is 21123003201319. The reversal of 21123003201312 is 21310230032112.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (21123003201319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18757273 + ... + 19851480.

It is an arithmetic number, because the mean of its divisors is an integer number (595926117990).

Almost surely, 2^{21123003201312} is an apocalyptic number.

It is an amenable number.

21123003201312 is an abundant number, since it is smaller than the sum of its proper divisors (36085904125728).

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

21123003201312 is a wasteful number, since it uses less digits than its factorization.

21123003201312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38608946 (or 38608938 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21123003201312 its reverse (21310230032112), we get a palindrome (42433233233424).

The spelling of 21123003201312 in words is "twenty-one trillion, one hundred twenty-three billion, three million, two hundred one thousand, three hundred twelve".