21375124004575 has 24 divisors (see below), whose sum is σ = 28923137055216. Its totient is φ = 15541015776000.

The previous prime is 21375124004497. The next prime is 21375124004603. The reversal of 21375124004575 is 57540042157312.

It is not a de Polignac number, because 21375124004575 - 2¹¹ = 21375124002527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10376596 + ... + 12264745.

It is an arithmetic number, because the mean of its divisors is an integer number (1205130710634).

Almost surely, 2^{21375124004575} is an apocalyptic number.

21375124004575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21375124004575 is a deficient number, since it is larger than the sum of its proper divisors (7548013050641).

21375124004575 is a wasteful number, since it uses less digits than its factorization.

21375124004575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22644795 (or 22644790 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 46.

The spelling of 21375124004575 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred twenty-four million, four thousand, five hundred seventy-five".