21146755777 has 8 divisors (see below), whose sum is σ = 24172655616. Its totient is φ = 18122089632.

The previous prime is 21146755757. The next prime is 21146755789. The reversal of 21146755777 is 77755764112.

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 21146755777 - 2¹¹ = 21146753729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21146755757) 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, 271393 + ... + 340510.

It is an arithmetic number, because the mean of its divisors is an integer number (3021581952).

Almost surely, 2^21146755777 is an apocalyptic number.

It is an amenable number.

21146755777 is a deficient number, since it is larger than the sum of its proper divisors (3025899839).

21146755777 is an equidigital number, since it uses as much as digits as its factorization.

21146755777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616847.

The product of its digits is 2881200, while the sum is 52.

The spelling of 21146755777 in words is "twenty-one billion, one hundred forty-six million, seven hundred fifty-five thousand, seven hundred seventy-seven".