21050511445 has 32 divisors (see below), whose sum is σ = 27544406400. Its totient is φ = 15382999296.

The previous prime is 21050511431. The next prime is 21050511541. The reversal of 21050511445 is 54411505012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21050511445 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2190942 + ... + 2200528.

It is an arithmetic number, because the mean of its divisors is an integer number (860762700).

Almost surely, 2^21050511445 is an apocalyptic number.

It is an amenable number.

21050511445 is a deficient number, since it is larger than the sum of its proper divisors (6493894955).

21050511445 is a wasteful number, since it uses less digits than its factorization.

21050511445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 21050511445 in words is "twenty-one billion, fifty million, five hundred eleven thousand, four hundred forty-five".