21444423011 has 8 divisors (see below), whose sum is σ = 24148558848. Its totient is φ = 18866061000.

The previous prime is 21444422971. The next prime is 21444423019. The reversal of 21444423011 is 11032444412.

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 21444423011 - 2²² = 21440228707 is a prime.

It is a super-2 number, since 2×21444423011² (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 (21444423019) 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, 31443095 + ... + 31443776.

It is an arithmetic number, because the mean of its divisors is an integer number (3018569856).

Almost surely, 2^21444423011 is an apocalyptic number.

21444423011 is a deficient number, since it is larger than the sum of its proper divisors (2704135837).

21444423011 is a wasteful number, since it uses less digits than its factorization.

21444423011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62886913.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21444423011 its reverse (11032444412), we get a palindrome (32476867423).

The spelling of 21444423011 in words is "twenty-one billion, four hundred forty-four million, four hundred twenty-three thousand, eleven".