21322064426381 has 2 divisors, whose sum is σ = 21322064426382. Its totient is φ = 21322064426380.

The previous prime is 21322064426353. The next prime is 21322064426387. The reversal of 21322064426381 is 18362446022312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16080982212100 + 5241082214281 = 4010110^2 + 2289341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21322064426381 is a prime.

It is a super-2 number, since 2×21322064426381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21322064426387) 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, 10661032213190 + 10661032213191.

It is an arithmetic number, because the mean of its divisors is an integer number (10661032213191).

Almost surely, 2^{21322064426381} is an apocalyptic number.

It is an amenable number.

21322064426381 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322064426381 is an equidigital number, since it uses as much as digits as its factorization.

21322064426381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 44.

The spelling of 21322064426381 in words is "twenty-one trillion, three hundred twenty-two billion, sixty-four million, four hundred twenty-six thousand, three hundred eighty-one".