21753282550 has 12 divisors (see below), whose sum is σ = 40461105636. Its totient is φ = 8701313000.

The previous prime is 21753282541. The next prime is 21753282557. The reversal of 21753282550 is 5528235712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21753282557) 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 5 ways as a sum of consecutive naturals, for example, 217532776 + ... + 217532875.

It is an arithmetic number, because the mean of its divisors is an integer number (3371758803).

Almost surely, 2^21753282550 is an apocalyptic number.

21753282550 is a deficient number, since it is larger than the sum of its proper divisors (18707823086).

21753282550 is a wasteful number, since it uses less digits than its factorization.

21753282550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435065663 (or 435065658 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 21753282550 in words is "twenty-one billion, seven hundred fifty-three million, two hundred eighty-two thousand, five hundred fifty".