221012021117 has 2 divisors, whose sum is σ = 221012021118. Its totient is φ = 221012021116.

The previous prime is 221012021093. The next prime is 221012021123. The reversal of 221012021117 is 711120210122.

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., 167296542361 + 53715478756 = 409019^2 + 231766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012021117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221212021117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506010558 + 110506010559.

It is an arithmetic number, because the mean of its divisors is an integer number (110506010559).

Almost surely, 2^221012021117 is an apocalyptic number.

It is an amenable number.

221012021117 is a deficient number, since it is larger than the sum of its proper divisors (1).

221012021117 is an equidigital number, since it uses as much as digits as its factorization.

221012021117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 221012021117 its reverse (711120210122), we get a palindrome (932132231239).

The spelling of 221012021117 in words is "two hundred twenty-one billion, twelve million, twenty-one thousand, one hundred seventeen".