21214243144 has 16 divisors (see below), whose sum is σ = 41059825920. Its totient is φ = 10264956240.

The previous prime is 21214243133. The next prime is 21214243189. The reversal of 21214243144 is 44134241212.

It is a super-2 number, since 2×21214243144² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 42770404 + ... + 42770899.

It is an arithmetic number, because the mean of its divisors is an integer number (2566239120).

Almost surely, 2^21214243144 is an apocalyptic number.

It is an amenable number.

21214243144 is a deficient number, since it is larger than the sum of its proper divisors (19845582776).

21214243144 is a wasteful number, since it uses less digits than its factorization.

21214243144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85541340 (or 85541336 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

Adding to 21214243144 its reverse (44134241212), we get a palindrome (65348484356).

The spelling of 21214243144 in words is "twenty-one billion, two hundred fourteen million, two hundred forty-three thousand, one hundred forty-four".