21275465777 has 8 divisors (see below), whose sum is σ = 21337758720. Its totient is φ = 21213208720.

The previous prime is 21275465749. The next prime is 21275465851. The reversal of 21275465777 is 77756457212.

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

It is a cyclic number.

It is not a de Polignac number, because 21275465777 - 2⁶ = 21275465713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21275465377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1578527 + ... + 1591947.

It is an arithmetic number, because the mean of its divisors is an integer number (2667219840).

Almost surely, 2^21275465777 is an apocalyptic number.

It is an amenable number.

21275465777 is a deficient number, since it is larger than the sum of its proper divisors (62292943).

21275465777 is a wasteful number, since it uses less digits than its factorization.

21275465777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17943.

The product of its digits is 5762400, while the sum is 53.

The spelling of 21275465777 in words is "twenty-one billion, two hundred seventy-five million, four hundred sixty-five thousand, seven hundred seventy-seven".