21040414401 has 4 divisors (see below), whose sum is σ = 28053885872. Its totient is φ = 14026942932.

The previous prime is 21040414393. The next prime is 21040414459. The reversal of 21040414401 is 10441404012.

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 21040414401 - 2³ = 21040414393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21040414601) 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, 3506735731 + ... + 3506735736.

It is an arithmetic number, because the mean of its divisors is an integer number (7013471468).

Almost surely, 2^21040414401 is an apocalyptic number.

It is an amenable number.

21040414401 is a deficient number, since it is larger than the sum of its proper divisors (7013471471).

21040414401 is an equidigital number, since it uses as much as digits as its factorization.

21040414401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013471470.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21040414401 its reverse (10441404012), we get a palindrome (31481818413).

The spelling of 21040414401 in words is "twenty-one billion, forty million, four hundred fourteen thousand, four hundred one".