21149056550 has 48 divisors (see below), whose sum is σ = 41835067920. Its totient is φ = 7926850560.

The previous prime is 21149056547. The next prime is 21149056571. The reversal of 21149056550 is 5565094112.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 138146 + ... + 247754.

It is an arithmetic number, because the mean of its divisors is an integer number (871563915).

Almost surely, 2^21149056550 is an apocalyptic number.

21149056550 is a deficient number, since it is larger than the sum of its proper divisors (20686011370).

21149056550 is a wasteful number, since it uses less digits than its factorization.

21149056550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109865 (or 109860 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 21149056550 in words is "twenty-one billion, one hundred forty-nine million, fifty-six thousand, five hundred fifty".