1211200001 has 4 divisors (see below), whose sum is σ = 1321309104. Its totient is φ = 1101090900.

The previous prime is 1211199971. The next prime is 1211200009. The reversal of 1211200001 is 1000021121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211200001 - 2³⁰ = 137458177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211200009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55054535 + ... + 55054556.

It is an arithmetic number, because the mean of its divisors is an integer number (330327276).

Almost surely, 2^1211200001 is an apocalyptic number.

1211200001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211200001 is a deficient number, since it is larger than the sum of its proper divisors (110109103).

1211200001 is a wasteful number, since it uses less digits than its factorization.

1211200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110109102.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1211200001 is about 34802.2987890168. The cubic root of 1211200001 is about 1065.9543858750.

Adding to 1211200001 its reverse (1000021121), we get a palindrome (2211221122).

The spelling of 1211200001 in words is "one billion, two hundred eleven million, two hundred thousand, one".