1212001011 has 12 divisors (see below), whose sum is σ = 1885335088. Its totient is φ = 745846704.

The previous prime is 1212001003. The next prime is 1212001019. The reversal of 1212001011 is 1101002121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1212001003) and next prime (1212001019).

It is not a de Polignac number, because 1212001011 - 2³ = 1212001003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1212000984 and 1212001002.

It is not an unprimeable number, because it can be changed into a prime (1212001019) 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 11 ways as a sum of consecutive naturals, for example, 5179375 + ... + 5179608.

Almost surely, 2^1212001011 is an apocalyptic number.

1212001011 is a deficient number, since it is larger than the sum of its proper divisors (673334077).

1212001011 is a wasteful number, since it uses less digits than its factorization.

1212001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10359002 (or 10358999 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1212001011 is about 34813.8048911635. The cubic root of 1212001011 is about 1066.1893187146.

Adding to 1212001011 its reverse (1101002121), we get a palindrome (2313003132).

The spelling of 1212001011 in words is "one billion, two hundred twelve million, one thousand, eleven".