21153324250 has 32 divisors (see below), whose sum is σ = 41320730880. Its totient is φ = 8093443600.

The previous prime is 21153324223. The next prime is 21153324259. The reversal of 21153324250 is 5242335112.

It is not an unprimeable number, because it can be changed into a prime (21153324259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1833670 + ... + 1845169.

It is an arithmetic number, because the mean of its divisors is an integer number (1291272840).

Almost surely, 2^21153324250 is an apocalyptic number.

21153324250 is a deficient number, since it is larger than the sum of its proper divisors (20167406630).

21153324250 is a wasteful number, since it uses less digits than its factorization.

21153324250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3678879 (or 3678869 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21153324250 its reverse (5242335112), we get a palindrome (26395659362).

The spelling of 21153324250 in words is "twenty-one billion, one hundred fifty-three million, three hundred twenty-four thousand, two hundred fifty".