21020244143441 has 2 divisors, whose sum is σ = 21020244143442. Its totient is φ = 21020244143440.

The previous prime is 21020244143323. The next prime is 21020244143473. The reversal of 21020244143441 is 14434144202012.

It is an a-pointer prime, because the next prime (21020244143473) can be obtained adding 21020244143441 to its sum of digits (32).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19973569872400 + 1046674271041 = 4469180^2 + 1023071^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020244143441 - 2³⁰ = 21019170401617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020244143398 and 21020244143407.

It is not a weakly prime, because it can be changed into another prime (21020244148441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510122071720 + 10510122071721.

It is an arithmetic number, because the mean of its divisors is an integer number (10510122071721).

Almost surely, 2^{21020244143441} is an apocalyptic number.

It is an amenable number.

21020244143441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020244143441 is an equidigital number, since it uses as much as digits as its factorization.

21020244143441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 21020244143441 its reverse (14434144202012), we get a palindrome (35454388345453).

The spelling of 21020244143441 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-three thousand, four hundred forty-one".