21375175477305 has 256 divisors, whose sum is σ = 39630982938624. Its totient is φ = 9756843233280.

The previous prime is 21375175477291. The next prime is 21375175477333. The reversal of 21375175477305 is 50377457157312.

It is not a de Polignac number, because 21375175477305 - 2⁹ = 21375175476793 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 11725273624 + ... + 11725275446.

It is an arithmetic number, because the mean of its divisors is an integer number (154808527104).

Almost surely, 2^{21375175477305} is an apocalyptic number.

It is an amenable number.

21375175477305 is a deficient number, since it is larger than the sum of its proper divisors (18255807461319).

21375175477305 is a wasteful number, since it uses less digits than its factorization.

21375175477305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488.

The product of its (nonzero) digits is 21609000, while the sum is 57.

The spelling of 21375175477305 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-five million, four hundred seventy-seven thousand, three hundred five".