21404010041 has 4 divisors (see below), whose sum is σ = 21697215732. Its totient is φ = 21110804352.

The previous prime is 21404009989. The next prime is 21404010053. The reversal of 21404010041 is 14001040412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16255230016 + 5148780025 = 127496^2 + 71755^2 .

It is a cyclic number.

It is not a de Polignac number, because 21404010041 - 2¹⁴ = 21403993657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404010241) 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, 146602736 + ... + 146602881.

It is an arithmetic number, because the mean of its divisors is an integer number (5424303933).

Almost surely, 2^21404010041 is an apocalyptic number.

It is an amenable number.

21404010041 is a deficient number, since it is larger than the sum of its proper divisors (293205691).

21404010041 is an equidigital number, since it uses as much as digits as its factorization.

21404010041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293205690.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21404010041 its reverse (14001040412), we get a palindrome (35405050453).

The spelling of 21404010041 in words is "twenty-one billion, four hundred four million, ten thousand, forty-one".