221011009993 has 2 divisors, whose sum is σ = 221011009994. Its totient is φ = 221011009992.

The previous prime is 221011009979. The next prime is 221011010039. The reversal of 221011009993 is 399900110122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220907520064 + 103489929 = 470008^2 + 10173^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011009993 - 2¹³ = 221011001801 is a prime.

It is not a weakly prime, because it can be changed into another prime (221011009393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505504996 + 110505504997.

It is an arithmetic number, because the mean of its divisors is an integer number (110505504997).

Almost surely, 2^221011009993 is an apocalyptic number.

It is an amenable number.

221011009993 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011009993 is an equidigital number, since it uses as much as digits as its factorization.

221011009993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 221011009993 in words is "two hundred twenty-one billion, eleven million, nine thousand, nine hundred ninety-three".