221332009993 has 2 divisors, whose sum is σ = 221332009994. Its totient is φ = 221332009992.

The previous prime is 221332009973. The next prime is 221332010023. The reversal of 221332009993 is 399900233122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165724710649 + 55607299344 = 407093^2 + 235812^2 .

It is a cyclic number.

It is not a de Polignac number, because 221332009993 - 2¹³ = 221332001801 is a prime.

It is not a weakly prime, because it can be changed into another prime (221332009903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110666004996 + 110666004997.

It is an arithmetic number, because the mean of its divisors is an integer number (110666004997).

Almost surely, 2^221332009993 is an apocalyptic number.

It is an amenable number.

221332009993 is a deficient number, since it is larger than the sum of its proper divisors (1).

221332009993 is an equidigital number, since it uses as much as digits as its factorization.

221332009993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 43.

The spelling of 221332009993 in words is "two hundred twenty-one billion, three hundred thirty-two million, nine thousand, nine hundred ninety-three".