21044804669 has 4 divisors (see below), whose sum is σ = 24051205344. Its totient is φ = 18038403996.

The previous prime is 21044804657. The next prime is 21044804717. The reversal of 21044804669 is 96640844012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21044804669 - 2⁸ = 21044804413 is a prime.

It is a super-2 number, since 2×21044804669² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044804369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1503200327 + ... + 1503200340.

It is an arithmetic number, because the mean of its divisors is an integer number (6012801336).

Almost surely, 2^21044804669 is an apocalyptic number.

It is an amenable number.

21044804669 is a deficient number, since it is larger than the sum of its proper divisors (3006400675).

21044804669 is an equidigital number, since it uses as much as digits as its factorization.

21044804669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006400674.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 21044804669 in words is "twenty-one billion, forty-four million, eight hundred four thousand, six hundred sixty-nine".