21253015750 has 32 divisors (see below), whose sum is σ = 40346040384. Its totient is φ = 8381464000.

The previous prime is 21253015643. The next prime is 21253015757. The reversal of 21253015750 is 5751035212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253015757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580927 + ... + 616426.

It is an arithmetic number, because the mean of its divisors is an integer number (1260813762).

Almost surely, 2^21253015750 is an apocalyptic number.

21253015750 is a deficient number, since it is larger than the sum of its proper divisors (19093024634).

21253015750 is a wasteful number, since it uses less digits than its factorization.

21253015750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197441 (or 1197431 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The spelling of 21253015750 in words is "twenty-one billion, two hundred fifty-three million, fifteen thousand, seven hundred fifty".