1221101120211 has 16 divisors (see below), whose sum is σ = 1891229215488. Its totient is φ = 686333181600.

The previous prime is 1221101120189. The next prime is 1221101120233. The reversal of 1221101120211 is 1120211011221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221101120189) and next prime (1221101120233).

It is not a de Polignac number, because 1221101120211 - 2²³ = 1221092731603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221101120011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476618985 + ... + 476621546.

It is an arithmetic number, because the mean of its divisors is an integer number (118201825968).

Almost surely, 2^{1221101120211} is an apocalyptic number.

1221101120211 is a deficient number, since it is larger than the sum of its proper divisors (670128095277).

1221101120211 is an equidigital number, since it uses as much as digits as its factorization.

1221101120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953240602.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221101120211 its reverse (1120211011221), we get a palindrome (2341312131432).

The spelling of 1221101120211 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty thousand, two hundred eleven".