21250640352 has 24 divisors (see below), whose sum is σ = 55782931176. Its totient is φ = 7083546752.

The previous prime is 21250640351. The next prime is 21250640381. The reversal of 21250640352 is 25304605212.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250640351) 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, 110680323 + ... + 110680514.

It is an arithmetic number, because the mean of its divisors is an integer number (2324288799).

Almost surely, 2^21250640352 is an apocalyptic number.

It is an amenable number.

21250640352 is an abundant number, since it is smaller than the sum of its proper divisors (34532290824).

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

21250640352 is a wasteful number, since it uses less digits than its factorization.

21250640352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221360850 (or 221360842 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21250640352 in words is "twenty-one billion, two hundred fifty million, six hundred forty thousand, three hundred fifty-two".