1211220210211 has 4 divisors (see below), whose sum is σ = 1321331138424. Its totient is φ = 1101109282000.

The previous prime is 1211220210191. The next prime is 1211220210217. The reversal of 1211220210211 is 1120120221121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211220210211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211220210217) 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, 55055464090 + ... + 55055464111.

It is an arithmetic number, because the mean of its divisors is an integer number (330332784606).

Almost surely, 2^{1211220210211} is an apocalyptic number.

1211220210211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211220210211 is a deficient number, since it is larger than the sum of its proper divisors (110110928213).

1211220210211 is a wasteful number, since it uses less digits than its factorization.

1211220210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110110928212.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211220210211 its reverse (1120120221121), we get a palindrome (2331340431332).

The spelling of 1211220210211 in words is "one trillion, two hundred eleven billion, two hundred twenty million, two hundred ten thousand, two hundred eleven".