21004400141 has 2 divisors, whose sum is σ = 21004400142. Its totient is φ = 21004400140.

The previous prime is 21004400089. The next prime is 21004400203. The reversal of 21004400141 is 14100440012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20884585225 + 119814916 = 144515^2 + 10946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004400141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004400441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502200070 + 10502200071.

It is an arithmetic number, because the mean of its divisors is an integer number (10502200071).

Almost surely, 2^21004400141 is an apocalyptic number.

It is an amenable number.

21004400141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004400141 is an equidigital number, since it uses as much as digits as its factorization.

21004400141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21004400141 its reverse (14100440012), we get a palindrome (35104840153).

The spelling of 21004400141 in words is "twenty-one billion, four million, four hundred thousand, one hundred forty-one".