21155055014 has 4 divisors (see below), whose sum is σ = 31732582524. Its totient is φ = 10577527506.

The previous prime is 21155055013. The next prime is 21155055079. The reversal of 21155055014 is 41055055112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155055013) 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 as a sum of consecutive naturals, namely, 5288763752 + ... + 5288763755.

It is an arithmetic number, because the mean of its divisors is an integer number (7933145631).

Almost surely, 2^21155055014 is an apocalyptic number.

21155055014 is a deficient number, since it is larger than the sum of its proper divisors (10577527510).

21155055014 is a wasteful number, since it uses less digits than its factorization.

21155055014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10577527509.

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 21155055014 in words is "twenty-one billion, one hundred fifty-five million, fifty-five thousand, fourteen".