21414440401 has 4 divisors (see below), whose sum is σ = 21419722852. Its totient is φ = 21409157952.

The previous prime is 21414440393. The next prime is 21414440423. The reversal of 21414440401 is 10404441412.

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 12881115025 + 8533325376 = 113495^2 + 92376^2 .

It is a cyclic number.

It is not a de Polignac number, because 21414440401 - 2³ = 21414440393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21414440501) 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, 2635140 + ... + 2643253.

It is an arithmetic number, because the mean of its divisors is an integer number (5354930713).

Almost surely, 2^21414440401 is an apocalyptic number.

It is an amenable number.

21414440401 is a deficient number, since it is larger than the sum of its proper divisors (5282451).

21414440401 is an equidigital number, since it uses as much as digits as its factorization.

21414440401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282450.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21414440401 its reverse (10404441412), we get a palindrome (31818881813).

The spelling of 21414440401 in words is "twenty-one billion, four hundred fourteen million, four hundred forty thousand, four hundred one".