21441100521047 has 2 divisors, whose sum is σ = 21441100521048. Its totient is φ = 21441100521046.

The previous prime is 21441100521037. The next prime is 21441100521097. The reversal of 21441100521047 is 74012500114412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21441100521047 - 2¹² = 21441100516951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21441100521037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720550260523 + 10720550260524.

It is an arithmetic number, because the mean of its divisors is an integer number (10720550260524).

Almost surely, 2^{21441100521047} is an apocalyptic number.

21441100521047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441100521047 is an equidigital number, since it uses as much as digits as its factorization.

21441100521047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 32.

Adding to 21441100521047 its reverse (74012500114412), we get a palindrome (95453600635459).

The spelling of 21441100521047 in words is "twenty-one trillion, four hundred forty-one billion, one hundred million, five hundred twenty-one thousand, forty-seven".