111201001212221 has 2 divisors, whose sum is σ = 111201001212222. Its totient is φ = 111201001212220.

The previous prime is 111201001212211. The next prime is 111201001212239. The reversal of 111201001212221 is 122212100102111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98558631628900 + 12642369583321 = 9927670^2 + 3555611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111201001212221 is a prime.

It is a super-2 number, since 2×111201001212221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111201001212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111201001212211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55600500606110 + 55600500606111.

It is an arithmetic number, because the mean of its divisors is an integer number (55600500606111).

Almost surely, 2^{111201001212221} is an apocalyptic number.

It is an amenable number.

111201001212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111201001212221 is an equidigital number, since it uses as much as digits as its factorization.

111201001212221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111201001212221 its reverse (122212100102111), we get a palindrome (233413101314332).

The spelling of 111201001212221 in words is "one hundred eleven trillion, two hundred one billion, one million, two hundred twelve thousand, two hundred twenty-one".