21013232542312 has 32 divisors (see below), whose sum is σ = 40823597008800. Its totient is φ = 10133659941184.

The previous prime is 21013232542297. The next prime is 21013232542319. The reversal of 21013232542312 is 21324523231012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21013232542319) 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, 419970838 + ... + 420020869.

It is an arithmetic number, because the mean of its divisors is an integer number (1275737406525).

Almost surely, 2^{21013232542312} is an apocalyptic number.

It is an amenable number.

21013232542312 is a deficient number, since it is larger than the sum of its proper divisors (19810364466488).

21013232542312 is a wasteful number, since it uses less digits than its factorization.

21013232542312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839991825 (or 839991821 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21013232542312 its reverse (21324523231012), we get a palindrome (42337755773324).

The spelling of 21013232542312 in words is "twenty-one trillion, thirteen billion, two hundred thirty-two million, five hundred forty-two thousand, three hundred twelve".