21004302401 has 2 divisors, whose sum is σ = 21004302402. Its totient is φ = 21004302400.

The previous prime is 21004302391. The next prime is 21004302463. The reversal of 21004302401 is 10420340012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20107240000 + 897062401 = 141800^2 + 29951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004302401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21004302401.

It is not a weakly prime, because it can be changed into another prime (21004302481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502151200 + 10502151201.

It is an arithmetic number, because the mean of its divisors is an integer number (10502151201).

Almost surely, 2^21004302401 is an apocalyptic number.

It is an amenable number.

21004302401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004302401 is an equidigital number, since it uses as much as digits as its factorization.

21004302401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21004302401 its reverse (10420340012), we get a palindrome (31424642413).

The spelling of 21004302401 in words is "twenty-one billion, four million, three hundred two thousand, four hundred one".