21231030012 has 48 divisors (see below), whose sum is σ = 50818048512. Its totient is φ = 6895123200.

The previous prime is 21231029983. The next prime is 21231030013. The reversal of 21231030012 is 21003013212.

It is a junction number, because it is equal to n+sod(n) for n = 21231029973 and 21231030000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231030013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155613 + ... + 258219.

It is an arithmetic number, because the mean of its divisors is an integer number (1058709344).

Almost surely, 2^21231030012 is an apocalyptic number.

It is an amenable number.

21231030012 is an abundant number, since it is smaller than the sum of its proper divisors (29587018500).

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

21231030012 is a wasteful number, since it uses less digits than its factorization.

21231030012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103058 (or 103056 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21231030012 its reverse (21003013212), we get a palindrome (42234043224).

The spelling of 21231030012 in words is "twenty-one billion, two hundred thirty-one million, thirty thousand, twelve".