21032310312 has 160 divisors (see below), whose sum is σ = 63539229600.
Its totient is φ = 6461513856.
The previous prime is 21032310311. The next prime is 21032310331. The reversal of 21032310312 is 21301323012.
21032310312 is a `hidden beast` number, since 2 + 10 + 32 + 310 + 312 = 666.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is not an unprimeable number, because it can be changed into a prime (21032310311) by changing a digit.
It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6965139 + ... + 6968157.
It is an arithmetic number, because the mean of its divisors is an integer number (397120185).
Almost surely, 221032310312 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21032310312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31769614800).
21032310312 is an abundant number, since it is smaller than the sum of its proper divisors (42506919288).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21032310312 is a wasteful number, since it uses less digits than its factorization.
21032310312 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3877 (or 3864 counting only the distinct ones).
The product of its (nonzero) digits is 216, while the sum is 18.
Adding to 21032310312 its reverse (21301323012), we get a palindrome (42333633324).
The spelling of 21032310312 in words is "twenty-one billion, thirty-two million, three hundred ten thousand, three hundred twelve".