21245175055 has 24 divisors (see below), whose sum is σ = 28018263312. Its totient is φ = 15454543104.

The previous prime is 21245175019. The next prime is 21245175113. The reversal of 21245175055 is 55057154212.

It is not a de Polignac number, because 21245175055 - 2¹¹ = 21245173007 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 (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131014 + ... + 244243.

It is an arithmetic number, because the mean of its divisors is an integer number (1167427638).

Almost surely, 2^21245175055 is an apocalyptic number.

21245175055 is a deficient number, since it is larger than the sum of its proper divisors (6773088257).

21245175055 is a wasteful number, since it uses less digits than its factorization.

21245175055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375355 (or 375342 counting only the distinct ones).

The product of its (nonzero) digits is 70000, while the sum is 37.

The spelling of 21245175055 in words is "twenty-one billion, two hundred forty-five million, one hundred seventy-five thousand, fifty-five".