1212200001 has 6 divisors (see below), whose sum is σ = 1750955570. Its totient is φ = 808133328.

The previous prime is 1212199951. The next prime is 1212200021. The reversal of 1212200001 is 1000022121.

It can be written as a sum of positive squares in only one way, i.e., 1173747600 + 38452401 = 34260^2 + 6201^2 .

It is not a de Polignac number, because 1212200001 - 2⁹ = 1212199489 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: 134688889 = 1212200001 / (1 + 2 + 1 + 2 + 2 + 0 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212200021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67344436 + ... + 67344453.

Almost surely, 2^1212200001 is an apocalyptic number.

It is an amenable number.

1212200001 is a deficient number, since it is larger than the sum of its proper divisors (538755569).

1212200001 is a wasteful number, since it uses less digits than its factorization.

1212200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134688895 (or 134688892 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1212200001 is about 34816.6626918779. The cubic root of 1212200001 is about 1066.2476655863.

Adding to 1212200001 its reverse (1000022121), we get a palindrome (2212222122).

The spelling of 1212200001 in words is "one billion, two hundred twelve million, two hundred thousand, one".