21444120422142 has 16 divisors (see below), whose sum is σ = 46787171830272. Its totient is φ = 6498218309720.

The previous prime is 21444120422141. The next prime is 21444120422167. The reversal of 21444120422142 is 24122402144412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444120422141) 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, 162455457678 + ... + 162455457809.

It is an arithmetic number, because the mean of its divisors is an integer number (2924198239392).

Almost surely, 2^{21444120422142} is an apocalyptic number.

21444120422142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21444120422142 is an abundant number, since it is smaller than the sum of its proper divisors (25343051408130).

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

21444120422142 is a wasteful number, since it uses less digits than its factorization.

21444120422142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324910915503.

The product of its (nonzero) digits is 32768, while the sum is 33.

Adding to 21444120422142 its reverse (24122402144412), we get a palindrome (45566522566554).

The spelling of 21444120422142 in words is "twenty-one trillion, four hundred forty-four billion, one hundred twenty million, four hundred twenty-two thousand, one hundred forty-two".