21141004321 has 4 divisors (see below), whose sum is σ = 21870004500. Its totient is φ = 20412004144.

The previous prime is 21141004289. The next prime is 21141004331. The reversal of 21141004321 is 12340014112.

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 17099223696 + 4041780625 = 130764^2 + 63575^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141004321 - 2⁵ = 21141004289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141004331) 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, 364500046 + ... + 364500103.

It is an arithmetic number, because the mean of its divisors is an integer number (5467501125).

Almost surely, 2^21141004321 is an apocalyptic number.

It is an amenable number.

21141004321 is a deficient number, since it is larger than the sum of its proper divisors (729000179).

21141004321 is an equidigital number, since it uses as much as digits as its factorization.

21141004321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729000178.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21141004321 its reverse (12340014112), we get a palindrome (33481018433).

The spelling of 21141004321 in words is "twenty-one billion, one hundred forty-one million, four thousand, three hundred twenty-one".