1211201201 has 4 divisors (see below), whose sum is σ = 1384229952. Its totient is φ = 1038172452.

The previous prime is 1211201107. The next prime is 1211201207. The reversal of 1211201201 is 1021021121.

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 1211201201 - 2¹⁸ = 1210939057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211201207) 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, 86514365 + ... + 86514378.

It is an arithmetic number, because the mean of its divisors is an integer number (346057488).

Almost surely, 2^1211201201 is an apocalyptic number.

It is an amenable number.

1211201201 is a deficient number, since it is larger than the sum of its proper divisors (173028751).

1211201201 is an equidigital number, since it uses as much as digits as its factorization.

1211201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173028750.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1211201201 is about 34802.3160292530. The cubic root of 1211201201 is about 1065.9547379074.

Adding to 1211201201 its reverse (1021021121), we get a palindrome (2232222322).

The spelling of 1211201201 in words is "one billion, two hundred eleven million, two hundred one thousand, two hundred one".