21301264441 has 2 divisors, whose sum is σ = 21301264442. Its totient is φ = 21301264440.

The previous prime is 21301264427. The next prime is 21301264451. The reversal of 21301264441 is 14446210312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20362148416 + 939116025 = 142696^2 + 30645^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301264441 - 2²¹ = 21299167289 is a prime.

It is a super-2 number, since 2×21301264441² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21301264421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650632220 + 10650632221.

It is an arithmetic number, because the mean of its divisors is an integer number (10650632221).

Almost surely, 2^21301264441 is an apocalyptic number.

It is an amenable number.

21301264441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301264441 is an equidigital number, since it uses as much as digits as its factorization.

21301264441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21301264441 its reverse (14446210312), we get a palindrome (35747474753).

The spelling of 21301264441 in words is "twenty-one billion, three hundred one million, two hundred sixty-four thousand, four hundred forty-one".