21575281389 has 16 divisors (see below), whose sum is σ = 29784766464. Its totient is φ = 13877463600.

The previous prime is 21575281379. The next prime is 21575281391. The reversal of 21575281389 is 98318257512.

It is not a de Polignac number, because 21575281389 - 2⁴ = 21575281373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21575281379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319659 + ... + 381224.

It is an arithmetic number, because the mean of its divisors is an integer number (1861547904).

Almost surely, 2^21575281389 is an apocalyptic number.

It is an amenable number.

21575281389 is a deficient number, since it is larger than the sum of its proper divisors (8209485075).

21575281389 is a wasteful number, since it uses less digits than its factorization.

21575281389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701248.

The product of its digits is 1209600, while the sum is 51.

The spelling of 21575281389 in words is "twenty-one billion, five hundred seventy-five million, two hundred eighty-one thousand, three hundred eighty-nine".