21240443214 has 20 divisors (see below), whose sum is σ = 47594326824. Its totient is φ = 7080147684.

The previous prime is 21240443201. The next prime is 21240443239. The reversal of 21240443214 is 41234404212.

21240443214 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 0 + 443 + 214 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 65556762 + ... + 65557085.

Almost surely, 2^21240443214 is an apocalyptic number.

21240443214 is an abundant number, since it is smaller than the sum of its proper divisors (26353883610).

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

21240443214 is a wasteful number, since it uses less digits than its factorization.

21240443214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131113861 (or 131113852 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21240443214 its reverse (41234404212), we get a palindrome (62474847426).

The spelling of 21240443214 in words is "twenty-one billion, two hundred forty million, four hundred forty-three thousand, two hundred fourteen".