21075087283471 has 16 divisors (see below), whose sum is σ = 22931135735200. Its totient is φ = 19253009812608.

The previous prime is 21075087283451. The next prime is 21075087283483. The reversal of 21075087283471 is 17438278057012.

It is not a de Polignac number, because 21075087283471 - 2³⁹ = 20525331469583 is a prime.

It is a super-3 number, since 3×21075087283471³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21075087283451) 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, 7439976 + ... + 9874381.

It is an arithmetic number, because the mean of its divisors is an integer number (1433195983450).

Almost surely, 2^{21075087283471} is an apocalyptic number.

21075087283471 is a deficient number, since it is larger than the sum of its proper divisors (1856048451729).

21075087283471 is a wasteful number, since it uses less digits than its factorization.

21075087283471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17315338.

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 21075087283471 in words is "twenty-one trillion, seventy-five billion, eighty-seven million, two hundred eighty-three thousand, four hundred seventy-one".