21012424324 has 12 divisors (see below), whose sum is σ = 38039733900. Its totient is φ = 10143928928.

The previous prime is 21012424297. The next prime is 21012424331. The reversal of 21012424324 is 42342421012.

It can be written as a sum of positive squares in 2 ways, for example, as 16228212100 + 4784212224 = 127390^2 + 69168^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90570679 + ... + 90570910.

It is an arithmetic number, because the mean of its divisors is an integer number (3169977825).

Almost surely, 2^21012424324 is an apocalyptic number.

It is an amenable number.

21012424324 is a deficient number, since it is larger than the sum of its proper divisors (17027309576).

21012424324 is a wasteful number, since it uses less digits than its factorization.

21012424324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181141622 (or 181141620 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21012424324 its reverse (42342421012), we get a palindrome (63354845336).

The spelling of 21012424324 in words is "twenty-one billion, twelve million, four hundred twenty-four thousand, three hundred twenty-four".