21040334401 has 2 divisors, whose sum is σ = 21040334402. Its totient is φ = 21040334400.

The previous prime is 21040334389. The next prime is 21040334423. The reversal of 21040334401 is 10443304012.

It is an a-pointer prime, because the next prime (21040334423) can be obtained adding 21040334401 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19881000000 + 1159334401 = 141000^2 + 34049^2 .

It is a cyclic number.

It is not a de Polignac number, because 21040334401 - 2¹⁷ = 21040203329 is a prime.

It is not a weakly prime, because it can be changed into another prime (21049334401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520167200 + 10520167201.

It is an arithmetic number, because the mean of its divisors is an integer number (10520167201).

Almost surely, 2^21040334401 is an apocalyptic number.

It is an amenable number.

21040334401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040334401 is an equidigital number, since it uses as much as digits as its factorization.

21040334401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21040334401 its reverse (10443304012), we get a palindrome (31483638413).

The spelling of 21040334401 in words is "twenty-one billion, forty million, three hundred thirty-four thousand, four hundred one".