21440356303615 has 16 divisors (see below), whose sum is σ = 26847258052608. Its totient is φ = 16406409339936.

The previous prime is 21440356303603. The next prime is 21440356303631. The reversal of 21440356303615 is 51630365304412.

It is a cyclic number.

It is not a de Polignac number, because 21440356303615 - 2⁹ = 21440356303103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16336114 + ... + 17599696.

It is an arithmetic number, because the mean of its divisors is an integer number (1677953628288).

Almost surely, 2^{21440356303615} is an apocalyptic number.

21440356303615 is a deficient number, since it is larger than the sum of its proper divisors (5406901748993).

21440356303615 is a wasteful number, since it uses less digits than its factorization.

21440356303615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411158.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 21440356303615 in words is "twenty-one trillion, four hundred forty billion, three hundred fifty-six million, three hundred three thousand, six hundred fifteen".