21434244144 has 20 divisors (see below), whose sum is σ = 55371797496. Its totient is φ = 7144748032.

The previous prime is 21434244137. The next prime is 21434244149. The reversal of 21434244144 is 44144243412.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21434244149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223273329 + ... + 223273424.

Almost surely, 2^21434244144 is an apocalyptic number.

21434244144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21434244144 is an abundant number, since it is smaller than the sum of its proper divisors (33937553352).

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

21434244144 is a wasteful number, since it uses less digits than its factorization.

21434244144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446546764 (or 446546758 counting only the distinct ones).

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

Adding to 21434244144 its reverse (44144243412), we get a palindrome (65578487556).

The spelling of 21434244144 in words is "twenty-one billion, four hundred thirty-four million, two hundred forty-four thousand, one hundred forty-four".