1212011001 has 6 divisors (see below), whose sum is σ = 1750682570. Its totient is φ = 808007328.

The previous prime is 1212010997. The next prime is 1212011063. The reversal of 1212011001 is 1001102121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1202702400 + 9308601 = 34680^2 + 3051^2 .

It is not a de Polignac number, because 1212011001 - 2² = 1212010997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 134667889 = 1212011001 / (1 + 2 + 1 + 2 + 0 + 1 + 1 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212011081) 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 5 ways as a sum of consecutive naturals, for example, 67333936 + ... + 67333953.

Almost surely, 2^1212011001 is an apocalyptic number.

It is an amenable number.

1212011001 is a deficient number, since it is larger than the sum of its proper divisors (538671569).

1212011001 is a wasteful number, since it uses less digits than its factorization.

1212011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134667895 (or 134667892 counting only the distinct ones).

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

The square root of 1212011001 is about 34813.9483684342. The cubic root of 1212011001 is about 1066.1922480857.

Adding to 1212011001 its reverse (1001102121), we get a palindrome (2213113122).

The spelling of 1212011001 in words is "one billion, two hundred twelve million, eleven thousand, one".