21250640324 has 12 divisors (see below), whose sum is σ = 37351017900. Its totient is φ = 10578920928.

The previous prime is 21250640317. The next prime is 21250640351. The reversal of 21250640324 is 42304605212.

It can be written as a sum of positive squares in 2 ways, for example, as 17988174400 + 3262465924 = 134120^2 + 57118^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11598779 + ... + 11600610.

It is an arithmetic number, because the mean of its divisors is an integer number (3112584825).

Almost surely, 2^21250640324 is an apocalyptic number.

It is an amenable number.

21250640324 is a deficient number, since it is larger than the sum of its proper divisors (16100377576).

21250640324 is a wasteful number, since it uses less digits than its factorization.

21250640324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23199622 (or 23199620 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 21250640324 in words is "twenty-one billion, two hundred fifty million, six hundred forty thousand, three hundred twenty-four".