1201213111 has 8 divisors (see below), whose sum is σ = 1432502784. Its totient is φ = 984845400.

The previous prime is 1201213109. The next prime is 1201213129. The reversal of 1201213111 is 1113121021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1201213111 - 2¹ = 1201213109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201213091 and 1201213100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201213411) 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 in 7 ways as a sum of consecutive naturals, for example, 3730315 + ... + 3730636.

It is an arithmetic number, because the mean of its divisors is an integer number (179062848).

Almost surely, 2^1201213111 is an apocalyptic number.

1201213111 is a deficient number, since it is larger than the sum of its proper divisors (231289673).

1201213111 is an equidigital number, since it uses as much as digits as its factorization.

1201213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7460981.

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

The square root of 1201213111 is about 34658.5214774087. The cubic root of 1201213111 is about 1063.0165382495.

Adding to 1201213111 its reverse (1113121021), we get a palindrome (2314334132).

The spelling of 1201213111 in words is "one billion, two hundred one million, two hundred thirteen thousand, one hundred eleven".