21041305401 has 4 divisors (see below), whose sum is σ = 28055073872. Its totient is φ = 14027536932.

The previous prime is 21041305393. The next prime is 21041305421. The reversal of 21041305401 is 10450314012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21041305401 - 2³ = 21041305393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21041305421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506884231 + ... + 3506884236.

It is an arithmetic number, because the mean of its divisors is an integer number (7013768468).

Almost surely, 2^21041305401 is an apocalyptic number.

It is an amenable number.

21041305401 is a deficient number, since it is larger than the sum of its proper divisors (7013768471).

21041305401 is an equidigital number, since it uses as much as digits as its factorization.

21041305401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013768470.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21041305401 its reverse (10450314012), we get a palindrome (31491619413).

The spelling of 21041305401 in words is "twenty-one billion, forty-one million, three hundred five thousand, four hundred one".