21154252750 has 96 divisors (see below), whose sum is σ = 41222877696. Its totient is φ = 8128200000.

The previous prime is 21154252727. The next prime is 21154252759. The reversal of 21154252750 is 5725245112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154252759) 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 47 ways as a sum of consecutive naturals, for example, 45887520 + ... + 45887980.

It is an arithmetic number, because the mean of its divisors is an integer number (429404976).

Almost surely, 2^21154252750 is an apocalyptic number.

21154252750 is a deficient number, since it is larger than the sum of its proper divisors (20068624946).

21154252750 is a wasteful number, since it uses less digits than its factorization.

21154252750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 34.

Adding to 21154252750 its reverse (5725245112), we get a palindrome (26879497862).

The spelling of 21154252750 in words is "twenty-one billion, one hundred fifty-four million, two hundred fifty-two thousand, seven hundred fifty".