21514446065 has 32 divisors (see below), whose sum is σ = 30299740416. Its totient is φ = 14358113280.

The previous prime is 21514446053. The next prime is 21514446091. The reversal of 21514446065 is 56064441512.

It is a happy number.

It is not a de Polignac number, because 21514446065 - 2⁶ = 21514446001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397469 + ... + 448341.

It is an arithmetic number, because the mean of its divisors is an integer number (946866888).

Almost surely, 2^21514446065 is an apocalyptic number.

It is an amenable number.

21514446065 is a deficient number, since it is larger than the sum of its proper divisors (8785294351).

21514446065 is a wasteful number, since it uses less digits than its factorization.

21514446065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51209.

The product of its (nonzero) digits is 115200, while the sum is 38.

Adding to 21514446065 its reverse (56064441512), we get a palindrome (77578887577).

The spelling of 21514446065 in words is "twenty-one billion, five hundred fourteen million, four hundred forty-six thousand, sixty-five".