14405840821 has 4 divisors (see below), whose sum is σ = 14533326252. Its totient is φ = 14278355392.

The previous prime is 14405840791. The next prime is 14405840863. The reversal of 14405840821 is 12804850441.

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

It can be written as a sum of positive squares in 2 ways, for example, as 206496900 + 14199343921 = 14370^2 + 119161^2 .

It is a cyclic number.

It is not a de Polignac number, because 14405840821 - 2⁵ = 14405840789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14405840021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63742546 + ... + 63742771.

It is an arithmetic number, because the mean of its divisors is an integer number (3633331563).

Almost surely, 2^14405840821 is an apocalyptic number.

It is an amenable number.

14405840821 is a deficient number, since it is larger than the sum of its proper divisors (127485431).

14405840821 is a wasteful number, since it uses less digits than its factorization.

14405840821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127485430.

The product of its (nonzero) digits is 40960, while the sum is 37.

The spelling of 14405840821 in words is "fourteen billion, four hundred five million, eight hundred forty thousand, eight hundred twenty-one".