21440200015 has 8 divisors (see below), whose sum is σ = 27707335488. Its totient is φ = 15832763040.

The previous prime is 21440200013. The next prime is 21440200027. The reversal of 21440200015 is 51000204412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21440200015 - 2¹ = 21440200013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21440199965 and 21440200001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440200013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164924551 + ... + 164924680.

It is an arithmetic number, because the mean of its divisors is an integer number (3463416936).

Almost surely, 2^21440200015 is an apocalyptic number.

21440200015 is a deficient number, since it is larger than the sum of its proper divisors (6267135473).

21440200015 is a wasteful number, since it uses less digits than its factorization.

21440200015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329849249.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 21440200015 its reverse (51000204412), we get a palindrome (72440404427).

The spelling of 21440200015 in words is "twenty-one billion, four hundred forty million, two hundred thousand, fifteen".