21248549250 has 64 divisors (see below), whose sum is σ = 53094158208. Its totient is φ = 5660107200.

The previous prime is 21248549239. The next prime is 21248549251. The reversal of 21248549250 is 5294584212.

It is not an unprimeable number, because it can be changed into a prime (21248549251) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 695292 + ... + 725208.

It is an arithmetic number, because the mean of its divisors is an integer number (829596222).

Almost surely, 2^21248549250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21248549250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26547079104).

21248549250 is an abundant number, since it is smaller than the sum of its proper divisors (31845608958).

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

21248549250 is a wasteful number, since it uses less digits than its factorization.

21248549250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30884 (or 30874 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 21248549250 in words is "twenty-one billion, two hundred forty-eight million, five hundred forty-nine thousand, two hundred fifty".