21304043401 has 2 divisors, whose sum is σ = 21304043402. Its totient is φ = 21304043400.

The previous prime is 21304043329. The next prime is 21304043429. The reversal of 21304043401 is 10434040312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20792198025 + 511845376 = 144195^2 + 22624^2 .

It is a cyclic number.

It is not a de Polignac number, because 21304043401 - 2¹⁵ = 21304010633 is a prime.

It is not a weakly prime, because it can be changed into another prime (21304043441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652021700 + 10652021701.

It is an arithmetic number, because the mean of its divisors is an integer number (10652021701).

Almost surely, 2^21304043401 is an apocalyptic number.

It is an amenable number.

21304043401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304043401 is an equidigital number, since it uses as much as digits as its factorization.

21304043401 is an evil number, because the sum of its binary digits is even.

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

Adding to 21304043401 its reverse (10434040312), we get a palindrome (31738083713).

The spelling of 21304043401 in words is "twenty-one billion, three hundred four million, forty-three thousand, four hundred one".