21444120242 has 32 divisors (see below), whose sum is σ = 33750670464. Its totient is φ = 10199200000.

The previous prime is 21444120241. The next prime is 21444120251. The reversal of 21444120242 is 24202144412.

It is a happy number.

It is a super-3 number, since 3×21444120242³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21444120241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11279492 + ... + 11281392.

It is an arithmetic number, because the mean of its divisors is an integer number (1054708452).

Almost surely, 2^21444120242 is an apocalyptic number.

21444120242 is a deficient number, since it is larger than the sum of its proper divisors (12306550222).

21444120242 is a wasteful number, since it uses less digits than its factorization.

21444120242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21444120242 its reverse (24202144412), we get a palindrome (45646264654).

The spelling of 21444120242 in words is "twenty-one billion, four hundred forty-four million, one hundred twenty thousand, two hundred forty-two".