21776606123 has 4 divisors (see below), whose sum is σ = 22133599728. Its totient is φ = 21419612520.

The previous prime is 21776606101. The next prime is 21776606141. The reversal of 21776606123 is 32160667712.

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

It is a cyclic number.

It is not a de Polignac number, because 21776606123 - 2¹² = 21776602027 is a prime.

It is a super-2 number, since 2×21776606123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21776606923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178496711 + ... + 178496832.

It is an arithmetic number, because the mean of its divisors is an integer number (5533399932).

Almost surely, 2^21776606123 is an apocalyptic number.

21776606123 is a deficient number, since it is larger than the sum of its proper divisors (356993605).

21776606123 is an equidigital number, since it uses as much as digits as its factorization.

21776606123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356993604.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 21776606123 in words is "twenty-one billion, seven hundred seventy-six million, six hundred six thousand, one hundred twenty-three".