21177896065 has 8 divisors (see below), whose sum is σ = 25503277248. Its totient is φ = 16882448880.

The previous prime is 21177896063. The next prime is 21177896087. The reversal of 21177896065 is 56069877112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21177896065 - 2¹ = 21177896063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21177896063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7481941 + ... + 7484770.

It is an arithmetic number, because the mean of its divisors is an integer number (3187909656).

Almost surely, 2^21177896065 is an apocalyptic number.

It is an amenable number.

21177896065 is a deficient number, since it is larger than the sum of its proper divisors (4325381183).

21177896065 is a wasteful number, since it uses less digits than its factorization.

21177896065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14966999.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 21177896065 in words is "twenty-one billion, one hundred seventy-seven million, eight hundred ninety-six thousand, sixty-five".