406163111021 has 2 divisors, whose sum is σ = 406163111022. Its totient is φ = 406163111020.

The previous prime is 406163110889. The next prime is 406163111033. The reversal of 406163111021 is 120111361604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 335340595396 + 70822515625 = 579086^2 + 266125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406163111021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406163111521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203081555510 + 203081555511.

It is an arithmetic number, because the mean of its divisors is an integer number (203081555511).

Almost surely, 2^406163111021 is an apocalyptic number.

It is an amenable number.

406163111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

406163111021 is an equidigital number, since it uses as much as digits as its factorization.

406163111021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 406163111021 its reverse (120111361604), we get a palindrome (526274472625).

The spelling of 406163111021 in words is "four hundred six billion, one hundred sixty-three million, one hundred eleven thousand, twenty-one".