21375332535 has 16 divisors (see below), whose sum is σ = 34469830656. Its totient is φ = 11310411168.

The previous prime is 21375332527. The next prime is 21375332579. The reversal of 21375332535 is 53523357312.

It is not a de Polignac number, because 21375332535 - 2³ = 21375332527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21375332493 and 21375332502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5608419 + ... + 5612228.

It is an arithmetic number, because the mean of its divisors is an integer number (2154364416).

Almost surely, 2^21375332535 is an apocalyptic number.

21375332535 is a deficient number, since it is larger than the sum of its proper divisors (13094498121).

21375332535 is a wasteful number, since it uses less digits than its factorization.

21375332535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11220782.

The product of its digits is 283500, while the sum is 39.

Adding to 21375332535 its reverse (53523357312), we get a palindrome (74898689847).

The spelling of 21375332535 in words is "twenty-one billion, three hundred seventy-five million, three hundred thirty-two thousand, five hundred thirty-five".