402171208441 has 4 divisors (see below), whose sum is σ = 403839968884. Its totient is φ = 400502448000.

The previous prime is 402171208429. The next prime is 402171208507. The reversal of 402171208441 is 144802171204.

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 356921410041 + 45249798400 = 597429^2 + 212720^2 .

It is a cyclic number.

It is not a de Polignac number, because 402171208441 - 2⁹ = 402171207929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402171208397 and 402171208406.

It is not an unprimeable number, because it can be changed into a prime (402171206441) 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, 834379860 + ... + 834380341.

It is an arithmetic number, because the mean of its divisors is an integer number (100959992221).

Almost surely, 2^402171208441 is an apocalyptic number.

It is an amenable number.

402171208441 is a deficient number, since it is larger than the sum of its proper divisors (1668760443).

402171208441 is a wasteful number, since it uses less digits than its factorization.

402171208441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668760442.

The product of its (nonzero) digits is 14336, while the sum is 34.

Adding to 402171208441 its reverse (144802171204), we get a palindrome (546973379645).

The spelling of 402171208441 in words is "four hundred two billion, one hundred seventy-one million, two hundred eight thousand, four hundred forty-one".