21430444323211 has 8 divisors (see below), whose sum is σ = 26718476039424. Its totient is φ = 16699047524520.

The previous prime is 21430444323193. The next prime is 21430444323311. The reversal of 21430444323211 is 11232344403412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21430444323211 - 2⁵ = 21430444323179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21430444323311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139158729295 + ... + 139158729448.

It is an arithmetic number, because the mean of its divisors is an integer number (3339809504928).

Almost surely, 2^{21430444323211} is an apocalyptic number.

21430444323211 is a deficient number, since it is larger than the sum of its proper divisors (5288031716213).

21430444323211 is a wasteful number, since it uses less digits than its factorization.

21430444323211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278317458761.

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 21430444323211 its reverse (11232344403412), we get a palindrome (32662788726623).

The spelling of 21430444323211 in words is "twenty-one trillion, four hundred thirty billion, four hundred forty-four million, three hundred twenty-three thousand, two hundred eleven".