21177775312 has 20 divisors (see below), whose sum is σ = 41163041860. Its totient is φ = 10555054848.

The previous prime is 21177775309. The next prime is 21177775361. The reversal of 21177775312 is 21357777112.

It can be written as a sum of positive squares in 2 ways, for example, as 7764429456 + 13413345856 = 88116^2 + 115816^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2109387 + ... + 2119402.

It is an arithmetic number, because the mean of its divisors is an integer number (2058152093).

Almost surely, 2^21177775312 is an apocalyptic number.

It is an amenable number.

21177775312 is a deficient number, since it is larger than the sum of its proper divisors (19985266548).

21177775312 is a wasteful number, since it uses less digits than its factorization.

21177775312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229110 (or 4229104 counting only the distinct ones).

The product of its digits is 144060, while the sum is 43.

The spelling of 21177775312 in words is "twenty-one billion, one hundred seventy-seven million, seven hundred seventy-five thousand, three hundred twelve".