1211212201 has 8 divisors (see below), whose sum is σ = 1241289000. Its totient is φ = 1181160960.

The previous prime is 1211212199. The next prime is 1211212213. The reversal of 1211212201 is 1022121121.

It can be written as a sum of positive squares in 4 ways, for example, as 8856576 + 1202355625 = 2976^2 + 34675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211212201 - 2¹ = 1211212199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211212291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120165 + ... + 129853.

It is an arithmetic number, because the mean of its divisors is an integer number (155161125).

Almost surely, 2^1211212201 is an apocalyptic number.

It is an amenable number.

1211212201 is a deficient number, since it is larger than the sum of its proper divisors (30076799).

1211212201 is an equidigital number, since it uses as much as digits as its factorization.

1211212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12779.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1211212201 is about 34802.4740643535. The cubic root of 1211212201 is about 1065.9579648600.

Adding to 1211212201 its reverse (1022121121), we get a palindrome (2233333322).

It can be divided in two parts, 121 and 1212201, that multiplied together give a square (146676321 = 12111²).

The spelling of 1211212201 in words is "one billion, two hundred eleven million, two hundred twelve thousand, two hundred one".