21004203200401 has 4 divisors (see below), whose sum is σ = 21004612315632. Its totient is φ = 21003794085172.

The previous prime is 21004203200339. The next prime is 21004203200417. The reversal of 21004203200401 is 10400230240012.

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 a cyclic number.

It is not a de Polignac number, because 21004203200401 - 2⁷ = 21004203200273 is a prime.

It is a super-2 number, since 2×21004203200401² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21004203200471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204480595 + ... + 204583288.

It is an arithmetic number, because the mean of its divisors is an integer number (5251153078908).

Almost surely, 2^{21004203200401} is an apocalyptic number.

It is an amenable number.

21004203200401 is a deficient number, since it is larger than the sum of its proper divisors (409115231).

21004203200401 is an equidigital number, since it uses as much as digits as its factorization.

21004203200401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409115230.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21004203200401 its reverse (10400230240012), we get a palindrome (31404433440413).

The spelling of 21004203200401 in words is "twenty-one trillion, four billion, two hundred three million, two hundred thousand, four hundred one".