21004102401 has 4 divisors (see below), whose sum is σ = 28005469872. Its totient is φ = 14002734932.

The previous prime is 21004102381. The next prime is 21004102403. The reversal of 21004102401 is 10420140012.

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 21004102401 - 2¹⁴ = 21004086017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21004102403) 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, 3500683731 + ... + 3500683736.

It is an arithmetic number, because the mean of its divisors is an integer number (7001367468).

Almost surely, 2^21004102401 is an apocalyptic number.

It is an amenable number.

21004102401 is a deficient number, since it is larger than the sum of its proper divisors (7001367471).

21004102401 is an equidigital number, since it uses as much as digits as its factorization.

21004102401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001367470.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21004102401 its reverse (10420140012), we get a palindrome (31424242413).

The spelling of 21004102401 in words is "twenty-one billion, four million, one hundred two thousand, four hundred one".