21250641433361 has 2 divisors, whose sum is σ = 21250641433362. Its totient is φ = 21250641433360.

The previous prime is 21250641433321. The next prime is 21250641433387. The reversal of 21250641433361 is 16333414605212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18734354022400 + 2516287410961 = 4328320^2 + 1586281^2 .

It is a cyclic number.

It is not a de Polignac number, because 21250641433361 - 2²² = 21250637239057 is a prime.

It is a super-2 number, since 2×21250641433361² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21250641433321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625320716680 + 10625320716681.

It is an arithmetic number, because the mean of its divisors is an integer number (10625320716681).

Almost surely, 2^{21250641433361} is an apocalyptic number.

It is an amenable number.

21250641433361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250641433361 is an equidigital number, since it uses as much as digits as its factorization.

21250641433361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 21250641433361 in words is "twenty-one trillion, two hundred fifty billion, six hundred forty-one million, four hundred thirty-three thousand, three hundred sixty-one".