21444022141 has 4 divisors (see below), whose sum is σ = 21684966300. Its totient is φ = 21203077984.

The previous prime is 21444022129. The next prime is 21444022153. The reversal of 21444022141 is 14122044412.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21444022129) and next prime (21444022153).

It can be written as a sum of positive squares in 2 ways, for example, as 3475692025 + 17968330116 = 58955^2 + 134046^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444022141 - 2⁵ = 21444022109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444022111) 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 3 ways as a sum of consecutive naturals, for example, 120471946 + ... + 120472123.

It is an arithmetic number, because the mean of its divisors is an integer number (5421241575).

Almost surely, 2^21444022141 is an apocalyptic number.

It is an amenable number.

21444022141 is a deficient number, since it is larger than the sum of its proper divisors (240944159).

21444022141 is an equidigital number, since it uses as much as digits as its factorization.

21444022141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240944158.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21444022141 its reverse (14122044412), we get a palindrome (35566066553).

The spelling of 21444022141 in words is "twenty-one billion, four hundred forty-four million, twenty-two thousand, one hundred forty-one".