21324676761 has 8 divisors (see below), whose sum is σ = 31592113760. Its totient is φ = 14216451156.

The previous prime is 21324676759. The next prime is 21324676777. The reversal of 21324676761 is 16767642312.

It is not a de Polignac number, because 21324676761 - 2¹ = 21324676759 is a prime.

It is a super-2 number, since 2×21324676761² (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 (21324676661) 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, 394901395 + ... + 394901448.

It is an arithmetic number, because the mean of its divisors is an integer number (3949014220).

Almost surely, 2^21324676761 is an apocalyptic number.

It is an amenable number.

21324676761 is a deficient number, since it is larger than the sum of its proper divisors (10267436999).

21324676761 is an equidigital number, since it uses as much as digits as its factorization.

21324676761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789802852 (or 789802846 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The spelling of 21324676761 in words is "twenty-one billion, three hundred twenty-four million, six hundred seventy-six thousand, seven hundred sixty-one".