21389226641 has 2 divisors, whose sum is σ = 21389226642. Its totient is φ = 21389226640.

The previous prime is 21389226629. The next prime is 21389226653. The reversal of 21389226641 is 14662298312.

It is a balanced prime because it is at equal distance from previous prime (21389226629) and next prime (21389226653).

It can be written as a sum of positive squares in only one way, i.e., 19797615616 + 1591611025 = 140704^2 + 39895^2 .

It is a cyclic number.

It is not a de Polignac number, because 21389226641 - 2⁶ = 21389226577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21389226592 and 21389226601.

It is not a weakly prime, because it can be changed into another prime (21389226601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694613320 + 10694613321.

It is an arithmetic number, because the mean of its divisors is an integer number (10694613321).

Almost surely, 2^21389226641 is an apocalyptic number.

It is an amenable number.

21389226641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21389226641 is an equidigital number, since it uses as much as digits as its factorization.

21389226641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The spelling of 21389226641 in words is "twenty-one billion, three hundred eighty-nine million, two hundred twenty-six thousand, six hundred forty-one".