21444040142 has 64 divisors (see below), whose sum is σ = 39357674496. Its totient is φ = 8553807360.

The previous prime is 21444040139. The next prime is 21444040201. The reversal of 21444040142 is 24104044412.

It is a super-2 number, since 2×21444040142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8385128 + ... + 8387684.

It is an arithmetic number, because the mean of its divisors is an integer number (614963664).

Almost surely, 2^21444040142 is an apocalyptic number.

21444040142 is a deficient number, since it is larger than the sum of its proper divisors (17913634354).

21444040142 is a wasteful number, since it uses less digits than its factorization.

21444040142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961.

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

Adding to 21444040142 its reverse (24104044412), we get a palindrome (45548084554).

The spelling of 21444040142 in words is "twenty-one billion, four hundred forty-four million, forty thousand, one hundred forty-two".