21329495641 has 4 divisors (see below), whose sum is σ = 21849727284. Its totient is φ = 20809264000.

The previous prime is 21329495609. The next prime is 21329495647. The reversal of 21329495641 is 14659492312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6324225625 + 15005270016 = 79525^2 + 122496^2 .

It is a cyclic number.

It is not a de Polignac number, because 21329495641 - 2⁵ = 21329495609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21329495591 and 21329495600.

It is not an unprimeable number, because it can be changed into a prime (21329495647) 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, 260115760 + ... + 260115841.

It is an arithmetic number, because the mean of its divisors is an integer number (5462431821).

Almost surely, 2^21329495641 is an apocalyptic number.

It is an amenable number.

21329495641 is a deficient number, since it is larger than the sum of its proper divisors (520231643).

21329495641 is an equidigital number, since it uses as much as digits as its factorization.

21329495641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520231642.

The product of its digits is 466560, while the sum is 46.

The spelling of 21329495641 in words is "twenty-one billion, three hundred twenty-nine million, four hundred ninety-five thousand, six hundred forty-one".