21375888945 has 32 divisors (see below), whose sum is σ = 35245566720. Its totient is φ = 11055759360.

The previous prime is 21375888931. The next prime is 21375888997. The reversal of 21375888945 is 54988857312.

It is not a de Polignac number, because 21375888945 - 2⁶ = 21375888881 is a prime.

It is a Curzon 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, 1360 + ... + 206769.

It is an arithmetic number, because the mean of its divisors is an integer number (1101423960).

Almost surely, 2^21375888945 is an apocalyptic number.

It is an amenable number.

21375888945 is a deficient number, since it is larger than the sum of its proper divisors (13869677775).

21375888945 is a wasteful number, since it uses less digits than its factorization.

21375888945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208345.

The product of its digits is 19353600, while the sum is 60.

The spelling of 21375888945 in words is "twenty-one billion, three hundred seventy-five million, eight hundred eighty-eight thousand, nine hundred forty-five".