21241204401 has 4 divisors (see below), whose sum is σ = 28321605872. Its totient is φ = 14160802932.

The previous prime is 21241204399. The next prime is 21241204417. The reversal of 21241204401 is 10440214212.

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 21241204401 - 2¹ = 21241204399 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 (21241204441) 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, 3540200731 + ... + 3540200736.

It is an arithmetic number, because the mean of its divisors is an integer number (7080401468).

Almost surely, 2^21241204401 is an apocalyptic number.

It is an amenable number.

21241204401 is a deficient number, since it is larger than the sum of its proper divisors (7080401471).

21241204401 is an equidigital number, since it uses as much as digits as its factorization.

21241204401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080401470.

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

Adding to 21241204401 its reverse (10440214212), we get a palindrome (31681418613).

The spelling of 21241204401 in words is "twenty-one billion, two hundred forty-one million, two hundred four thousand, four hundred one".