1201321111 has 2 divisors, whose sum is σ = 1201321112. Its totient is φ = 1201321110.

The previous prime is 1201321103. The next prime is 1201321117. The reversal of 1201321111 is 1111231021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1201321111 - 2³ = 1201321103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201321091 and 1201321100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201321117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600660555 + 600660556.

It is an arithmetic number, because the mean of its divisors is an integer number (600660556).

Almost surely, 2^1201321111 is an apocalyptic number.

1201321111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201321111 is an equidigital number, since it uses as much as digits as its factorization.

1201321111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1201321111 is about 34660.0795007744. The cubic root of 1201321111 is about 1063.0483955845.

Adding to 1201321111 its reverse (1111231021), we get a palindrome (2312552132).

It can be divided in two parts, 12013 and 21111, that added together give a square (33124 = 182²).

The spelling of 1201321111 in words is "one billion, two hundred one million, three hundred twenty-one thousand, one hundred eleven".