421665111011 has 2 divisors, whose sum is σ = 421665111012. Its totient is φ = 421665111010.

The previous prime is 421665110929. The next prime is 421665111053. The reversal of 421665111011 is 110111566124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421665111011 - 2¹⁸ = 421664848867 is a prime.

It is not a weakly prime, because it can be changed into another prime (421665111611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210832555505 + 210832555506.

It is an arithmetic number, because the mean of its divisors is an integer number (210832555506).

Almost surely, 2^421665111011 is an apocalyptic number.

421665111011 is a deficient number, since it is larger than the sum of its proper divisors (1).

421665111011 is an equidigital number, since it uses as much as digits as its factorization.

421665111011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

Adding to 421665111011 its reverse (110111566124), we get a palindrome (531776677135).

The spelling of 421665111011 in words is "four hundred twenty-one billion, six hundred sixty-five million, one hundred eleven thousand, eleven".