402144440213 has 4 divisors (see below), whose sum is σ = 402378110988. Its totient is φ = 401910769440.

The previous prime is 402144440177. The next prime is 402144440329. The reversal of 402144440213 is 312044441204.

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 208088331889 + 194056108324 = 456167^2 + 440518^2 .

It is a cyclic number.

It is not a de Polignac number, because 402144440213 - 2²⁶ = 402077331349 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 (402144440813) 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, 116832806 + ... + 116836247.

It is an arithmetic number, because the mean of its divisors is an integer number (100594527747).

Almost surely, 2^402144440213 is an apocalyptic number.

It is an amenable number.

402144440213 is a deficient number, since it is larger than the sum of its proper divisors (233670775).

402144440213 is a wasteful number, since it uses less digits than its factorization.

402144440213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233670774.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 402144440213 its reverse (312044441204), we get a palindrome (714188881417).

Subtracting from 402144440213 its reverse (312044441204), we obtain a palindrome (90099999009).

The spelling of 402144440213 in words is "four hundred two billion, one hundred forty-four million, four hundred forty thousand, two hundred thirteen".