405440021011 has 2 divisors, whose sum is σ = 405440021012. Its totient is φ = 405440021010.

The previous prime is 405440021009. The next prime is 405440021027. The reversal of 405440021011 is 110120044504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405440021011 - 2¹ = 405440021009 is a prime.

It is a super-2 number, since 2×405440021011² (a number of 24 digits) contains 22 as substring.

Together with 405440021009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (405440021071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202720010505 + 202720010506.

It is an arithmetic number, because the mean of its divisors is an integer number (202720010506).

Almost surely, 2^405440021011 is an apocalyptic number.

405440021011 is a deficient number, since it is larger than the sum of its proper divisors (1).

405440021011 is an equidigital number, since it uses as much as digits as its factorization.

405440021011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 405440021011 its reverse (110120044504), we get a palindrome (515560065515).

The spelling of 405440021011 in words is "four hundred five billion, four hundred forty million, twenty-one thousand, eleven".