21040835083489 has 4 divisors (see below), whose sum is σ = 22659360859156. Its totient is φ = 19422309307824.

The previous prime is 21040835083441. The next prime is 21040835083517. The reversal of 21040835083489 is 98438053804012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7696279963089 + 13344555120400 = 2774217^2 + 3653020^2 .

It is a cyclic number.

It is not a de Polignac number, because 21040835083489 - 2³¹ = 21038687599841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21040835083589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809262887814 + ... + 809262887839.

It is an arithmetic number, because the mean of its divisors is an integer number (5664840214789).

Almost surely, 2^{21040835083489} is an apocalyptic number.

It is an amenable number.

21040835083489 is a deficient number, since it is larger than the sum of its proper divisors (1618525775667).

21040835083489 is a wasteful number, since it uses less digits than its factorization.

21040835083489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618525775666.

The product of its (nonzero) digits is 6635520, while the sum is 55.

The spelling of 21040835083489 in words is "twenty-one trillion, forty billion, eight hundred thirty-five million, eighty-three thousand, four hundred eighty-nine".