21440440214 has 4 divisors (see below), whose sum is σ = 32160660324. Its totient is φ = 10720220106.

The previous prime is 21440440211. The next prime is 21440440243. The reversal of 21440440214 is 41204404412.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440440211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360110052 + ... + 5360110055.

It is an arithmetic number, because the mean of its divisors is an integer number (8040165081).

Almost surely, 2^21440440214 is an apocalyptic number.

21440440214 is a deficient number, since it is larger than the sum of its proper divisors (10720220110).

21440440214 is a wasteful number, since it uses less digits than its factorization.

21440440214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10720220109.

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

Adding to 21440440214 its reverse (41204404412), we get a palindrome (62644844626).

The spelling of 21440440214 in words is "twenty-one billion, four hundred forty million, four hundred forty thousand, two hundred fourteen".