111203031221 has 2 divisors, whose sum is σ = 111203031222. Its totient is φ = 111203031220.

The previous prime is 111203031187. The next prime is 111203031241. The reversal of 111203031221 is 122130302111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111202240900 + 790321 = 333470^2 + 889^2 .

It is an emirp because it is prime and its reverse (122130302111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111203031221 - 2¹⁸ = 111202769077 is a prime.

It is a super-2 number, since 2×111203031221² (a number of 23 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 111203031221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111203031241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55601515610 + 55601515611.

It is an arithmetic number, because the mean of its divisors is an integer number (55601515611).

Almost surely, 2^111203031221 is an apocalyptic number.

It is an amenable number.

111203031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111203031221 is an equidigital number, since it uses as much as digits as its factorization.

111203031221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 111203031221 its reverse (122130302111), we get a palindrome (233333333332).

The spelling of 111203031221 in words is "one hundred eleven billion, two hundred three million, thirty-one thousand, two hundred twenty-one".