1221001100211 has 32 divisors (see below), whose sum is σ = 1735109019648. Its totient is φ = 761963945600.

The previous prime is 1221001100197. The next prime is 1221001100213. The reversal of 1221001100211 is 1120011001221.

It is a de Polignac number, because none of the positive numbers 2^k-1221001100211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221001100213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54798805 + ... + 54821081.

It is an arithmetic number, because the mean of its divisors is an integer number (54222156864).

Almost surely, 2^{1221001100211} is an apocalyptic number.

1221001100211 is a deficient number, since it is larger than the sum of its proper divisors (514107919437).

1221001100211 is a wasteful number, since it uses less digits than its factorization.

1221001100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39251.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221001100211 its reverse (1120011001221), we get a palindrome (2341012101432).

The spelling of 1221001100211 in words is "one trillion, two hundred twenty-one billion, one million, one hundred thousand, two hundred eleven".