21577606135 has 4 divisors (see below), whose sum is σ = 25893127368. Its totient is φ = 17262084904.

The previous prime is 21577606121. The next prime is 21577606159. The reversal of 21577606135 is 53160677512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21577606135 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21577606091 and 21577606100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2157760609 + ... + 2157760618.

It is an arithmetic number, because the mean of its divisors is an integer number (6473281842).

Almost surely, 2^21577606135 is an apocalyptic number.

21577606135 is a deficient number, since it is larger than the sum of its proper divisors (4315521233).

21577606135 is an equidigital number, since it uses as much as digits as its factorization.

21577606135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315521232.

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 21577606135 in words is "twenty-one billion, five hundred seventy-seven million, six hundred six thousand, one hundred thirty-five".