21002012324 has 12 divisors (see below), whose sum is σ = 37356038748. Its totient is φ = 10328858400.

The previous prime is 21002012321. The next prime is 21002012329. The reversal of 21002012324 is 42321020012.

It can be written as a sum of positive squares in 2 ways, for example, as 1847452324 + 19154560000 = 42982^2 + 138400^2 .

It is not an unprimeable number, because it can be changed into a prime (21002012321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43036667 + ... + 43037154.

It is an arithmetic number, because the mean of its divisors is an integer number (3113003229).

Almost surely, 2^21002012324 is an apocalyptic number.

It is an amenable number.

21002012324 is a deficient number, since it is larger than the sum of its proper divisors (16354026424).

21002012324 is a wasteful number, since it uses less digits than its factorization.

21002012324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86073886 (or 86073884 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21002012324 its reverse (42321020012), we get a palindrome (63323032336).

The spelling of 21002012324 in words is "twenty-one billion, two million, twelve thousand, three hundred twenty-four".