402144441021 has 12 divisors (see below), whose sum is σ = 580880949948. Its totient is φ = 268093688064.

The previous prime is 402144441011. The next prime is 402144441037. The reversal of 402144441021 is 120144441204.

It is a happy number.

402144441021 is a `hidden beast` number, since 4 + 0 + 214 + 4 + 441 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 181821224025 + 220323216996 = 426405^2 + 469386^2 .

It is not a de Polignac number, because 402144441021 - 2⁵ = 402144440989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402144441011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1373071 + ... + 1640003.

It is an arithmetic number, because the mean of its divisors is an integer number (48406745829).

Almost surely, 2^402144441021 is an apocalyptic number.

It is an amenable number.

402144441021 is a deficient number, since it is larger than the sum of its proper divisors (178736508927).

402144441021 is a wasteful number, since it uses less digits than its factorization.

402144441021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434332 (or 434329 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 402144441021 its reverse (120144441204), we get a palindrome (522288882225).

The spelling of 402144441021 in words is "four hundred two billion, one hundred forty-four million, four hundred forty-one thousand, twenty-one".