1200221111 has 2 divisors, whose sum is σ = 1200221112. Its totient is φ = 1200221110.

The previous prime is 1200221107. The next prime is 1200221137. The reversal of 1200221111 is 1111220021.

It is a weak prime.

It is an emirp because it is prime and its reverse (1111220021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200221111 - 2² = 1200221107 is a prime.

It is a super-4 number, since 4×1200221111⁴ (a number of 37 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1200221092 and 1200221101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200221311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600110555 + 600110556.

It is an arithmetic number, because the mean of its divisors is an integer number (600110556).

Almost surely, 2^1200221111 is an apocalyptic number.

1200221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200221111 is an equidigital number, since it uses as much as digits as its factorization.

1200221111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1200221111 is about 34644.2074667613. The cubic root of 1200221111 is about 1062.7238333684.

Adding to 1200221111 its reverse (1111220021), we get a palindrome (2311441132).

The spelling of 1200221111 in words is "one billion, two hundred million, two hundred twenty-one thousand, one hundred eleven".