21444434142 has 8 divisors (see below), whose sum is σ = 42888868296. Its totient is φ = 7148144712.

The previous prime is 21444434087. The next prime is 21444434147. The reversal of 21444434142 is 24143444412.

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

21444434142 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444434147) 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, 1787036173 + ... + 1787036184.

It is an arithmetic number, because the mean of its divisors is an integer number (5361108537).

Almost surely, 2^21444434142 is an apocalyptic number.

21444434142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21444434142 is a wasteful number, since it uses less digits than its factorization.

21444434142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574072362.

The product of its digits is 49152, while the sum is 33.

Adding to 21444434142 its reverse (24143444412), we get a palindrome (45587878554).

The spelling of 21444434142 in words is "twenty-one billion, four hundred forty-four million, four hundred thirty-four thousand, one hundred forty-two".